docs: update system documentation and sync i18n for v3.5.5

docs/i18n/pt-BR/README.md

@@ -4,6 +4,7 @@
 
 ---
 
+
 ### Never stop coding. Smart routing to **FREE & low-cost AI models** with automatic fallback.
 
 _Your universal API proxy — one endpoint, 60+ providers, zero downtime. Now with **MCP Server (25 tools)**, **A2A Protocol**, **Memory/Skills Systems** & **Electron Desktop App**._
@@ -247,7 +248,7 @@ Developers pay $20–200/month for Claude Pro, Codex Pro, or GitHub Copilot. Eve
 - **Smart 4-Tier Fallback** — If subscription quota runs out, automatically redirects to API Key → Cheap → Free with zero manual intervention
 - **Provider Limits Tracking** — Cached quota snapshots refresh on a server-side schedule (default `PROVIDER_LIMITS_SYNC_INTERVAL_MINUTES=70`) with manual refresh available in the UI
 - **Multi-Account Support** — Multiple accounts per provider with auto round-robin — when one runs out, switches to the next
-- **Custom Combos** — Customizable fallback chains with 9 balancing strategies (priority, weighted, fill-first, round-robin, P2C, random, least-used, cost-optimized, strict-random)
+- **Custom Combos** — Customizable fallback chains with 13 balancing strategies (priority, weighted, fill-first, round-robin, P2C, random, least-used, cost-optimized, strict-random, auto, lkgp, context-optimized, **context-relay**)
 - **Codex Business Quotas** — Business/Team workspace quota monitoring directly in the dashboard
 
 </details>
@@ -1308,7 +1309,17 @@ Then in `/dashboard/media` → **Transcription** tab: upload any audio or video
 
 ## 💡 Key Features
 
-OmniRoute v2.0 is built as an operational platform, not just a relay proxy.
+OmniRoute v3.5 is built as an operational platform, not just a relay proxy.
+
+### 🆕 New — v3.5.5 Highlights (Apr 2026)
+
+| Feature                                     | What It Does                                                                                                               |
+| ------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------- |
+| 🔗 **Context Relay Strategy**               | New combo strategy that preserves session continuity via structured handoff summaries when accounts rotate mid-conversation |
+| 🛡️ **Proxy Hardening**                      | Token health check, API key validation, and undici dispatcher all honor proxy config — no more bypass in restricted envs   |
+| ⚠️ **Node.js 24 Login Warning**             | Login page proactively detects incompatible Node.js versions and shows a clear warning banner with instructions            |
+| 📎 **Gemini PDF Attachments**               | PDF files attached in chat messages are now correctly routed to Gemini via `inline_data` and generic base64 detection       |
+| 🔒 **CodeQL Security Hardening**            | Resolved SSRF, insecure randomness, polynomial ReDoS, and incomplete URL sanitization alerts                               |
 
 ### 🆕 New — ClawRouter-Inspired Improvements (Mar 2026)
 
@@ -1360,7 +1371,8 @@ OmniRoute v2.0 is built as an operational platform, not just a relay proxy.
 | 🔄 **Format Translation**          | OpenAI ↔ Claude ↔ Gemini ↔ Responses with schema-safe conversions        |
 | 👥 **Multi-Account Support**       | Multiple accounts per provider with intelligent selection                |
 | 🔄 **Auto Token Refresh**          | OAuth tokens refresh automatically with retry                            |
-| 🎨 **Custom Combos**               | 9 balancing strategies + fallback chain control                          |
+| 🎨 **Custom Combos**               | 13 balancing strategies + fallback chain control                         |
+| 🔗 **Context Relay**               | Session continuity handoffs when account rotation happens mid-session    |
 | 🌐 **Wildcard Router**             | `provider/*` dynamic routing                                             |
 | 🧠 **Thinking Budget Controls**    | Passthrough, auto, custom, and adaptive reasoning limits                 |
 | 🔀 **Model Aliases**               | Built-in + custom model aliasing and migration safety                    |
@@ -2187,9 +2199,10 @@ Se não quiser criar credenciais próprias agora, ainda é possível usar o flux
 | ---------------------------------------------- | --------------------------------------------------- |
 | [User Guide](docs/USER_GUIDE.md)               | Providers, combos, CLI integration, deployment      |
 | [API Reference](docs/API_REFERENCE.md)         | All endpoints with examples                         |
-| [MCP Server](open-sse/mcp-server/README.md)    | 16 MCP tools, IDE configs, Python/TS/Go clients     |
+| [MCP Server](open-sse/mcp-server/README.md)    | 25 MCP tools, IDE configs, Python/TS/Go clients     |
 | [A2A Server](src/lib/a2a/README.md)            | JSON-RPC 2.0 protocol, skills, streaming, task mgmt |
 | [Auto-Combo Engine](docs/auto-combo.md)        | 6-factor scoring, mode packs, self-healing          |
+| [Context Relay](docs/features/context-relay.md)| Session handoff strategy for account rotation        |
 | [Troubleshooting](docs/TROUBLESHOOTING.md)     | Common problems and solutions                       |
 | [Architecture](docs/ARCHITECTURE.md)           | System architecture and internals                   |
 | [Contributing](CONTRIBUTING.md)                | Development setup and guidelines                    |