v3.6.4

### ✨ New Features

- **feat(docs):** integrate multi-page documentation into OmniRoute dashboard (#1969)
- **feat(settings):** add request body limit setting (#1968)
- **feat(auth):** add Gemini CLI OAuth client secret default (#1974)
- **feat(models):** expose models.dev context windows in /v1/models (#1972)
- **fix(db):** resolve legacy encryption fallback causing re-encryption loops (#1941)
- **fix(auth):** fix Codex assistant final_answer response sanitization (#1965)

- **feat(providers):** Implement Image Generation and Editing capabilities for ChatGPT Web, including in-band chat image generation and caching (#1606).
- **feat(ui):** Integrate OpenCode Zen/Go API tool logo SVG and polish API key copy-to-clipboard interactions (#1607).

- **feat(providers):** Integrate AgentRouter as a new OpenAI-compatible passthrough provider with $200 free credits via sign-up (Issue #1572).
- **feat(ui):** Implement on-demand per-model testing in the provider dashboard, allowing single-token diagnostic checks without triggering rate-limits (Issue #1532).

- **Combo Builder v2 (Wizard UI):** Completely redesigned the combo creation/editing interface as a multi-stage wizard with stages: Basics → Steps → Strategy → Review. The builder fetches provider, model, and connection metadata via a new `GET /api/combos/builder/options` endpoint, enabling precise provider/model/account selection with duplicate detection and automatic next-connection suggestion. Heavy UI components (`ModelSelectModal`, `ProxyConfigModal`, `ModelRoutingSection`) are now lazily loaded via `next/dynamic` for faster initial page render
- **Combo Step Architecture (Schema v2):** Introduced a structured step model (`ComboModelStep`, `ComboRefStep`) replacing the legacy flat string/object combo entries. Steps carry explicit `id`, `kind`, `providerId`, `connectionId`, `weight`, and `label` fields, enabling pinned-account routing, cross-combo references, and per-step metrics. All combo CRUD operations normalize entries through the new `src/lib/combos/steps.ts` module. Zod schemas updated with `comboModelStepInputSchema` and `comboRefStepInputSchema` unions
- **Composite Tiers System:** Added tiered model routing via `config.compositeTiers` — each tier maps a named stage to a specific combo step with optional fallback chains. Includes comprehensive validation (`src/lib/combos/compositeTiers.ts`) ensuring step existence, preventing circular fallback, and validating default tier references. Zod schema enforcement blocks composite tiers on global defaults (concrete combos only)
- **Model Capabilities Registry:** Created `src/lib/modelCapabilities.ts` providing `getResolvedModelCapabilities()` — a unified resolver that merges static specs, provider registry data, and live-synced capabilities into a single `ResolvedModelCapabilities` object covering tool calling, reasoning, vision, context window, thinking budget, modalities, and model lifecycle metadata
- **Observability Module:** Extracted health and telemetry payload construction into `src/lib/monitoring/observability.ts` with `buildHealthPayload()`, `buildTelemetryPayload()`, and `buildSessionsSummary()` builders. The health endpoint now returns session activity, quota monitor status, and per-provider breakdowns alongside existing system metrics
- **Session & Quota Monitor Dashboard:** Added live Session Activity and Quota Monitors panels to the Health dashboard, showing active session counts, sticky-bound sessions, per-API-key breakdowns, and top session details alongside quota monitor alerting/exhausted/error status with per-provider drill-down
- **Combo Health Per-Target Analytics:** The combo-health API now resolves per-target metrics using the new `resolveNestedComboTargets()` function, providing step-level success rates, latency, and historical usage breakdowns per execution key — enabling per-account, per-connection health visibility
- **Auto-Combo → Combos Unification:** Merged the separate `/dashboard/auto-combo` page into the main `/dashboard/combos` page. Auto/LKGP combos are now managed alongside all other combos with a new strategy filter tabs system (All / Intelligent / Deterministic). The old auto-combo route redirects to `/dashboard/combos?filter=intelligent`. Removed the `auto-combo` sidebar entry, consolidating navigation into the single `Combos` item
- **Intelligent Routing Panel (`IntelligentComboPanel`):** New inline panel (371 lines) within the combos page that shows real-time provider scores, 6-factor scoring breakdown (quota, health, cost, latency, task fitness, stability), mode pack selector, incident mode status, and excluded providers for `auto`/`lkgp` combos — replacing the former standalone auto-combo dashboard
- **Builder Intelligent Step (`BuilderIntelligentStep`):** New conditional wizard step (280 lines) that appears in the Builder v2 flow only when `strategy=auto` or `strategy=lkgp` is selected. Exposes candidate pool selection, mode pack presets, router sub-strategy selector, exploration rate slider, budget cap, and collapsible advanced scoring weights configuration
- **Intelligent Routing Module (`intelligentRouting.ts`):** Extracted strategy categorization and filtering logic into a dedicated shared module (210 lines) with `getStrategyCategory()`, `isIntelligentStrategy()`, `filterCombosByStrategyCategory()`, `normalizeIntelligentRoutingFilter()`, and `normalizeIntelligentRoutingConfig()` utility functions
- **LKGP Standalone Strategy:** Implemented `lkgp` (Last Known Good Provider) as a fully functional standalone combo strategy. Previously, `lkgp` as a combo strategy silently fell through to `priority` ordering — the LKGP lookup only ran inside the `auto` engine. Now `strategy: "lkgp"` correctly queries the LKGP state, moves the last successful provider to the top of the target list, and saves the LKGP state after each successful request. Falls back to priority ordering when no LKGP state exists
- **Unified Routing Rules & Model Aliases:** Consolidated the routing rules and model alias management controls into the Settings page, reducing fragmentation across the dashboard

### ⚡ Performance

- **Middleware Lazy Loading:** Refactored `src/proxy.ts` to lazy-import `apiAuth`, `db/settings`, and `modelSyncScheduler` modules, reducing middleware cold-start overhead. Added inline `isPublicApiRoute()` to avoid loading the full auth module for public routes
- **E2E Auth Bypass:** Added `NEXT_PUBLIC_OMNIROUTE_E2E_MODE` environment flag to bypass authentication gates for dashboard and management API routes during Playwright E2E test runs

### 🐛 Bug Fixes

- **fix(mitm):** Compile MITM utilities as NodeNext ESM during prepublish, copy the CommonJS MITM server into the standalone artifact, and resolve MITM data paths without relying on Next.js aliases in packaged runtime.
- **fix(build):** Move the local `.tmp/wine32` Wine prefix out of the isolated Next.js build path so Windows Electron packaging artifacts cannot trigger `EACCES` scans during Node 24 builds.
- **fix(build):** Copy the `wreq-js` native runtime directory into the isolated Next.js standalone output so packaged Playwright/E2E starts can load the instrumentation hook on Linux.
- **fix(api):** Validate the Codex Responses websocket bridge and `/v1/batches` JSON payloads with Zod before use, keeping `request.json()` route validation green and returning explicit 400 responses for invalid bodies.
- **fix(providers):** Add explicit typing to provider alias and category helpers so the strict `typecheck:noimplicit:core` CI gate passes.
- **fix(ui):** Keep the upstream proxy provider detail page labeled with a fallback "Managed via Upstream Proxy Settings" management surface when translations are unavailable.
- **fix(electron):** Harden the production desktop CSP by removing `unsafe-eval` outside development and adding object, base URI, form action, frame ancestor, and worker restrictions.
- **fix(cli):** Replace shell-interpolated setup and privileged command execution paths with argument-based `spawn`/`execFile` helpers for database setup, Tailscale sudo commands, MITM DNS edits, and certificate install/uninstall flows.
- **fix(ui):** Keep provider icons resilient by using direct `@lobehub/icons` components first, then local PNG/SVG fallbacks, avoiding the `@lobehub/ui` peer runtime in the dashboard.

- **P2C Credential Selection:** Implemented Power-of-Two-Choices (P2C) connection scoring in `src/sse/services/auth.ts` with quota headroom awareness, error/recency penalties, and forced/excluded connection support. The new `getProviderCredentialsWithQuotaPreflight()` function integrates quota preflight checks directly into credential selection, eliminating the separate Codex-only preflight path
- **Fixed-Account Combo Steps:** Combo steps with explicit `connectionId` now correctly bypass provider-level model cooldowns and circuit breakers, preventing a single account failure from blocking pinned-connection routing for the same model
- **Combo Metrics Per-Target Tracking:** Extended `comboMetrics.ts` to track `byTarget` metrics keyed by execution path, recording per-step `provider`, `providerId`, `connectionId`, and `label` alongside existing per-model aggregates
- **Call Logs Schema Expansion:** Added `requested_model`, `request_type`, `tokens_cache_read`, `tokens_cache_creation`, `tokens_reasoning`, `combo_step_id`, and `combo_execution_key` columns to `call_logs` with auto-migration. Added composite index `idx_cl_combo_target` for efficient per-target historical queries
- **Quota Monitor Enrichment:** Expanded `quotaMonitor.ts` with full lifecycle state tracking (`status`, `startedAt`, `lastPolledAt`, `consecutiveFailures`, `totalPolls`, `totalAlerts`), ISO-formatted snapshots via `getQuotaMonitorSnapshots()`, and sorted summary via `getQuotaMonitorSummary()`
- **Codex Quota Fetcher Hardening:** Improved `codexQuotaFetcher.ts` with safer connection registration and quota fetch error handling
- **LKGP Save Refactored to Async/Await:** Replaced fire-and-forget `.then()` chain for LKGP persistence after successful combo routing with proper `async/await` + `try/catch`, preventing unhandled promise rejections and ensuring LKGP state is reliably saved before the response is returned
- **Duplicate `auto` in Combo Strategy Schema:** Removed duplicate `"auto"` entry from `comboStrategySchema` (was listed on both line 104 and 108). Harmless to Zod runtime but cleaned up to avoid confusion. Schema now has exactly 13 unique strategy values
- **Legacy Combo Refs Normalization:** Fixed combo step normalization to preserve legacy string combo references during CRUD operations, preventing data loss when editing combos created before the v2 step architecture

### 🔒 Security

- **Auth Bypass on Backup Routes (Critical):** Added `isAuthenticated` guards to `/api/db-backups/exportAll` (full database export) and `/api/db-backups` (list, create, and restore backups) — both were previously accessible without authentication
- **Auth Guard on Translator Save:** Added `isAuthenticated` guard to `/api/translator/save` for defense-in-depth consistency
- **API Key Secret Hardening:** Removed the hardcoded `"omniroute-default-insecure-api-key-secret"` fallback from `apiKey.ts` — the function now fails fast if `API_KEY_SECRET` is unset, relying on the startup validator to auto-generate it
- **NPM Tarball Leak Fix:** Added `app/.env*` to `.npmignore` to prevent the working `.env` file from being shipped inside the npm tarball distribution
- **Electron Builder CVE Fix:** Bumped `electron-builder` to 26.8.1 to resolve `tar` CVEs in the desktop build pipeline

### 🔧 Maintenance & Infrastructure

- **DB Migration 021:** Added `combo_call_log_targets` migration for `combo_step_id` and `combo_execution_key` columns in call_logs
- **Combo CRUD Normalization:** `db/combos.ts` now normalizes all stored combo entries through the step normalization pipeline on read, ensuring consistent step IDs and kind annotations regardless of when the combo was created
- **Playwright Config:** Updated Playwright configuration and `run-next-playwright.mjs` script for improved E2E test orchestration
- **Build Script:** Updated `build-next-isolated.mjs` with additional reliability improvements
- **Auto-Combo UI Cleanup:** Deleted `AutoComboModal.tsx` (161 lines), replaced `auto-combo/page.tsx` (478→5 lines) with a server-side redirect to `/dashboard/combos?filter=intelligent`
- **Sidebar Consolidation:** Removed `"auto-combo"` from `HIDEABLE_SIDEBAR_ITEM_IDS` and `PRIMARY_SIDEBAR_ITEMS` — `normalizeHiddenSidebarItems()` silently discards any stale `"auto-combo"` entries in user settings
- **Schema Cleanup:** Removed obsolete `createAutoComboSchema` from `schemas.ts`. Exported `comboStrategySchema` for direct use in test and filter modules
- **A2A Agent Card Update:** Renamed skill ID from `auto-combo` to `intelligent-routing` with updated description referencing the unified combos dashboard
- **Builder Draft Refactor:** Extended `builderDraft.ts` with dynamic stage list generation via `getComboBuilderStages()` and `isIntelligentBuilderStrategy()`. Stage navigation (`getNextComboBuilderStage`, `getPreviousComboBuilderStage`, `canAccessComboBuilderStage`) now accepts options to conditionally include/skip the `intelligent` wizard step
- **i18n Consolidation:** Removed the standalone `"autoCombo"` i18n block (22 keys) from all 30 language files. Migrated keys into the `"combos"` block with new additions for filter tabs, intelligent panel, and builder step labels

### 🧪 Tests

- **16 New Test Suites:** Added comprehensive test coverage including:
  - `combo-builder-draft.test.mjs` (186 lines) — Builder draft step construction and validation
  - `combo-builder-options-route.test.mjs` (228 lines) — Builder options API endpoint
  - `combo-health-route.test.mjs` (266 lines) — Combo health analytics with per-target metrics
  - `combo-routes-composite-tiers.test.mjs` (157 lines) — Composite tiers API integration
  - `composite-tiers-validation.test.mjs` (131 lines) — Composite tier validation rules
  - `db-combos-crud.test.mjs` — Combo CRUD with step normalization
  - `db-core-init.test.mjs` (129 lines) — DB initialization and column migrations
  - `model-capabilities-registry.test.mjs` (105 lines) — Model capabilities resolution
  - `observability-payloads.test.mjs` (165 lines) — Health/telemetry payload construction
  - `openapi-spec-route.test.mjs` — OpenAPI spec generation
  - `proxy-e2e-mode.test.mjs` (74 lines) — E2E mode auth bypass
  - `quota-monitor.test.mjs` — Quota monitor lifecycle state
  - `run-next-playwright.test.mjs` (119 lines) — Playwright runner script
  - `sse-auth.test.mjs` (154 lines) — P2C credential selection and quota preflight
  - `telemetry-summary-route.test.mjs` (35 lines) — Telemetry summary endpoint
  - Plus updates to 12 existing test files for compatibility with new step architecture
- **Auto-Combo Unification Tests:**
  - `autocombo-unification.test.mjs` (156 lines) — Strategy categorization, schema deduplication, sidebar cleanup, and routing strategies metadata validation
  - `combo-unification.spec.ts` (189 lines) — Playwright E2E tests for filter tabs, intelligent panel rendering, redirect from old route, sidebar entry removal, and Builder v2 intelligent step flow
  - 3 new LKGP standalone tests in `combo-routing-engine.test.mjs` — Validates LKGP provider prioritization, fallback to priority when no state exists, and LKGP state persistence after successful requests
  - Updated `combo-builder-draft.test.mjs` with intelligent stage navigation tests
  - Updated `sidebar-visibility.test.mjs` to reflect `auto-combo` removal