v3.5.6

### ✨ 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).

- **Email Privacy Masking:** OAuth account emails are now masked in the provider dashboard (e.g. `di*****@g****.com`) to prevent accidental exposure when sharing screenshots. Full address visible on hover via `title` attribute (#1025).
- **OpenRouter & GitHub in Embedding/Image Registries:** OpenRouter (3 embedding models, 4 image models) and GitHub Models (2 embedding models via Azure inference) are now first-class entries in the provider registries, enabling their use for `/v1/embeddings` and `/v1/images/generations` (#960).
- **Model Visibility Toggle & Search Filter:** The provider page model list now includes a real-time search/filter bar and a per-model visibility toggle (👁 icon). Hidden models are grayed out and excluded from the `/v1/models` catalog. An active-count badge (`N/M active`) shows at a glance how many models are enabled (#750).
- **Chinese Localization (zh-CN):** Added missing translations for Context Relay, Memory, LKGP, and Models.dev sync features, while standardizing terminology across the application (#1079).
- **Environment Auto-Sync:** Added `sync-env.mjs` to auto-generate and append `.env` from `.env.example` during installation, automatically generating cryptographic secrets on first run.
- **Source Mode Dashboard Update:** Fixed real-time Source (git-checkout) updating in the dashboard, enabling secure, real-time update pipelines for non-NPM installations.

### 🐛 Bug Fixes & Security

- **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.

- **Hardcoded Secret Cleanup:** Removed 12 hardcoded OAuth credential fallbacks from the source code, forcing secure reliance on environment variables and resolving static analysis security alerts.
- **Next.js Security Patch:** Bumped `next` from 16.2.2 to 16.2.3 to resolve critical RSC deserialization RCE vulnerability (SNYK-JS-NEXT-15954202).
- **Memory/Cache UI Crash:** Added null-safety guards (`?? 0`) to `.toLocaleString()` calls in Memory and Cache dashboard pages, preventing `TypeError` crashes when database tables are empty or contain null numeric values (#1083).
- **WebSearch tool_choice Translation:** Fixed OpenAI-to-Claude translator dropping `tool_choice` objects with `type: "function"` as-is, which Claude rejects. Now properly maps all OpenAI `tool_choice` variants (`function`, `required`, `none`) to Claude-compatible format (`tool`, `any`, `auto`), fixing "Did 0 searches" in Claude Code WebSearch (#1072).
- **Provider Validation baseUrl Override:** Added `baseUrl` passthrough from frontend validation requests to the backend validation endpoint. Chinese-site users of Alibaba Coding Plan (bailian-coding-plan) can now validate API keys against their custom Base URL instead of always hitting the international endpoint (#1078).
- **Minimax Auth Header:** Switched Minimax provider from `x-api-key` to `Authorization: Bearer` header format, matching the current API spec (#1076).
- **Native Fetch Fallback:** Added graceful fallback to native `fetch` when the `undici` dispatcher fails, improving resilience in environments where undici is unavailable (#1054).
- **EPIPE Flood Fix:** Added circuit-breaker logic to prevent EPIPE errors from creating a feedback loop that fills logs at GB/s (#1006).
- **Qoder PAT Validation:** Improved Qoder Personal Access Token validation with actionable error messages that guide users to the correct token format (#966).
- **CI/CD Pipeline:** Fixed `check:docs-sync` failure by syncing OpenAPI version to 3.5.6 and finalizing CHANGELOG release heading. Commented out `DATA_DIR` in `.env.example` to prevent E2E test failures in CI runners lacking root permissions.

### 🌍 i18n

- **Auto Language Generation (CI):** Added CI pipeline to auto-generate missing language files and strings via `feat(CI,i18n)` workflow, covering 30+ locales (#1071).