Initial commit: Multi-service AI agent system

- Frontend: Vite + React + TypeScript chat interface
- Backend: FastAPI gateway with LangGraph routing
- Knowledge Service: ChromaDB RAG with Gitea scraper
- LangGraph Service: Multi-agent orchestration
- Airflow: Scheduled Gitea ingestion DAG
- Documentation: Complete plan and implementation guides

Architecture:
- Modular Docker Compose per service
- External ai-mesh network for communication
- Fast rebuilds with /app/packages pattern
- Intelligent agent routing (no hardcoded keywords)

Services:
- Frontend (5173): React chat UI
- Chat Gateway (8000): FastAPI entry point
- LangGraph (8090): Agent orchestration
- Knowledge (8080): ChromaDB RAG
- Airflow (8081): Scheduled ingestion
- PostgreSQL (5432): Chat history

Excludes: node_modules, .venv, chroma_db, logs, .env files
Includes: All source code, configs, docs, docker files

knowledge_service/docker-compose.yml

@@ -0,0 +1,24 @@
+services:
+  knowledge-service:
+    build: .
+    image: sam/knowledge-service:latest
+    container_name: knowledge-service
+    ports:
+      - "8080:8080"
+    volumes:
+      # Only mount the code directory, not packages
+      - ./data:/app/code/data
+      - ./chroma_db:/app/code/chroma_db
+      - ./main.py:/app/code/main.py:ro  # Read-only mount for safety
+    environment:
+      - PYTHONUNBUFFERED=1
+      - OPENROUTER_API_KEY=${OPENROUTER_API_KEY}
+      - PYTHONPATH=/app/packages
+    networks:
+      - ai-mesh
+    restart: unless-stopped
+
+networks:
+  ai-mesh:
+    external: true
+