feat(channels): add google chat adapter and webhook route

README.md

@@ -6,7 +6,7 @@ Self-hosted personal AI assistant with Telegram and Terminal interfaces.
 
 - **Multi-Frontend**: Telegram bot + Terminal UI (minimal & fullscreen modes) + Web UI dashboard
 - **Multi-Model**: Anthropic Claude, OpenAI, GitHub Copilot, Gemini, Bedrock, Zhipu AI (GLM), xAI (Grok), Ollama, llama.cpp with intelligent routing
-- **Multi-Channel**: Telegram, Discord, Slack, WhatsApp, Matrix, Signal, and Microsoft Teams with unified adapter interface
+- **Multi-Channel**: Telegram, Discord, Slack, WhatsApp, Matrix, Signal, Microsoft Teams, and Google Chat with unified adapter interface
 - **Web Dashboard**: SPA control panel with health monitoring, chat, session browser, usage stats, and settings editor
 - **Model Switching**: Switch between cloud/local models on demand
 - **Session Persistence**: SQLite-backed conversation history
@@ -160,6 +160,18 @@ teams:
 # Bot Framework messaging endpoint should point to:
 # POST https://<your-flynn-host>/teams/events
 
+# Optional: Google Chat
+google_chat:
+  service_account_key_file: "~/.config/flynn/google-chat-service-account.json"
+  # or:
+  # service_account_json: "${GOOGLE_CHAT_SERVICE_ACCOUNT_JSON}"
+  webhook_token: "${GOOGLE_CHAT_WEBHOOK_TOKEN}"
+  allowed_space_names: []
+  require_mention: true
+
+# Google Chat messaging endpoint should point to:
+# POST https://<your-flynn-host>/google-chat/events
+
 models:
   default:
     provider: anthropic