v3.5.5

### ✨ 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).

- **Node.js 24 Compatibility Warning:** Added a proactive version incompatibility warning on the login page to guide users to the stable Node.js 22 LTS, preventing native sqlite binding crashes.
- **Context Relay Combo Strategy:** Added the new `context-relay` combo strategy with priority-style routing, structured handoff summary generation once quota usage reaches the warning threshold, and handoff injection after the next real account switch.
- **Global Context Relay Defaults:** Added global Settings defaults plus combo-level configuration for `handoffThreshold`, `handoffModel`, and `handoffProviders`, so new or unconfigured combos can inherit the feature consistently.

### 🐛 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.

- **Proxy Connection Healthchecks:** Applied proxy resolution per connection in the sweeping loop (`tokenHealthCheck.ts`) and global provider validation sweeps, resolving Node 22 bypass and improving proxy stability (#1051, #1056, #1061).
- **Security Vulnerability Remediation:** Resolved multiple CodeQL scanning alerts including SSRF in model sync, insecure randomness in web crypto (`generateSessionId`), and incomplete URL sanitization.
- **Context Relay Typing & Synchronization:** Reverted out-of-scope test breakages and resolved `handoffProvider` and response `input` extraction payload typing.
- **Legacy OpenAI-Compatible Responses Routing:** Fixed legacy/imported OpenAI-compatible providers (for example `openai-compatible-sp-openai`) incorrectly routing Chat Completions traffic to `/chat/completions` when the real provider node was configured as `apiType: "responses"`. OmniRoute now treats `providerSpecificData.apiType` as authoritative across routing, executors, and translator tools, avoiding false empty-content failures during combo/provider smoke tests (#1069).
- **Gemini PDF Attachment Integration:** Fixed payload generation and format for parsing `inline_data` and generic base64 sources for deep Gemini PDF routing (#993, #1021).
- **Vercel AI SDK Fallbacks:** Mapped `max_output_tokens` to `max_tokens` for strict OpenAI-compatible providers, resolving errors from standard AI agents and frameworks (#994).
- **External Auth & UI Reliability:** Handled null `state` failures in Cline OAuth exchange (#1016), added 3rd-party 400 error patterns to combo fallback (#1024), and resolved desktop sidebar layout and popover overflows (#1039, #1001).
- **Context Relay In-Flight Deduplication:** Prevented duplicate handoff generation for the same session/combo while an earlier summary request is still in flight.
- **Context Relay Provider Gating:** Aligned runtime behavior with configuration so explicit `handoffProviders` exclusions, including an empty array, now disable handoff generation as expected.

### 🛠️ Maintenance & Dependabot

- **Updated Sub-dependencies:** Bumped `hono` to `4.12.12` and `@hono/node-server` to `1.19.13` to patch critical security gaps (#1063, #1064, #1067, #1068).

### 📚 Documentation

- **Documentation Synchronization:** Updated system documentation (README, Architecture, Features, Tools, Troubleshooting) and synced `i18n` configurations to match the v3.5.5 context relay patterns and proxy troubleshooting steps.
- **Context Relay Delivery Notes:** Documented the current architecture, runtime flow, and Codex-focused scope in the feature docs, changelog, and agent guidance.