feat(agentic-rag): add multi-provider LLM, auth, and Docker support

## Added
- Multi-provider LLM support with factory pattern (8 providers):
  * OpenAI, Z.AI, OpenCode Zen, OpenRouter, Anthropic, Google, Mistral, Azure
- Authentication system: JWT + API Key dual-mode
- Provider management API (/api/v1/providers)
- Docker containerization (Dockerfile + docker-compose.yml)
- Updated documentation in main.py

## Modified
- Documents API: added authentication
- Query API: support for provider/model selection
- RAG service: dynamic LLM provider selection
- Config: multi-provider settings

## Infrastructure
- Qdrant vector store integration
- Redis support (optional)
- Health check endpoints

🚀 Ready for production deployment

docker-compose.yml

@@ -0,0 +1,110 @@
+# AgenticRAG - Docker Compose
+# Complete stack with API, Qdrant, and optional services
+
+version: '3.8'
+
+services:
+  # Main API service
+  api:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: agenticrag-api
+    ports:
+      - "8000:8000"
+    environment:
+      - OPENAI_API_KEY=${OPENAI_API_KEY:-}
+      - ZAI_API_KEY=${ZAI_API_KEY:-}
+      - OPENCODE_ZEN_API_KEY=${OPENCODE_ZEN_API_KEY:-}
+      - OPENROUTER_API_KEY=${OPENROUTER_API_KEY:-}
+      - ANTHROPIC_API_KEY=${ANTHROPIC_API_KEY:-}
+      - GOOGLE_API_KEY=${GOOGLE_API_KEY:-}
+      - DEFAULT_LLM_PROVIDER=${DEFAULT_LLM_PROVIDER:-openai}
+      - DEFAULT_LLM_MODEL=${DEFAULT_LLM_MODEL:-gpt-4o-mini}
+      - QDRANT_HOST=qdrant
+      - QDRANT_PORT=6333
+      - JWT_SECRET=${JWT_SECRET:-your-secret-key-change-in-production}
+      - JWT_ALGORITHM=${JWT_ALGORITHM:-HS256}
+      - ACCESS_TOKEN_EXPIRE_MINUTES=${ACCESS_TOKEN_EXPIRE_MINUTES:-30}
+      - ADMIN_API_KEY=${ADMIN_API_KEY:-admin-api-key-change-in-production}
+      - CORS_ORIGINS=${CORS_ORIGINS:-http://localhost:3000,http://localhost:5173}
+      - LOG_LEVEL=${LOG_LEVEL:-INFO}
+    volumes:
+      - ./uploads:/app/uploads
+      - ./data:/app/data
+    depends_on:
+      qdrant:
+        condition: service_healthy
+    networks:
+      - agenticrag-network
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8000/api/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s
+
+  # Qdrant Vector Database
+  qdrant:
+    image: qdrant/qdrant:latest
+    container_name: agenticrag-qdrant
+    ports:
+      - "6333:6333"
+      - "6334:6334"
+    volumes:
+      - qdrant-storage:/qdrant/storage
+    networks:
+      - agenticrag-network
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:6333/healthz"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+      start_period: 10s
+
+  # Optional: Redis for caching
+  redis:
+    image: redis:7-alpine
+    container_name: agenticrag-redis
+    ports:
+      - "6379:6379"
+    volumes:
+      - redis-data:/data
+    networks:
+      - agenticrag-network
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 10s
+      timeout: 3s
+      retries: 5
+
+  # Optional: Nginx reverse proxy
+  nginx:
+    image: nginx:alpine
+    container_name: agenticrag-nginx
+    ports:
+      - "80:80"
+      - "443:443"
+    volumes:
+      - ./nginx/nginx.conf:/etc/nginx/nginx.conf:ro
+      - ./nginx/ssl:/etc/nginx/ssl:ro
+    depends_on:
+      - api
+    networks:
+      - agenticrag-network
+    restart: unless-stopped
+    profiles:
+      - production
+
+volumes:
+  qdrant-storage:
+    driver: local
+  redis-data:
+    driver: local
+
+networks:
+  agenticrag-network:
+    driver: bridge