feat: Migrate data storage to PostgreSQL with schema setup, initialization script, and update documentation

docker-compose.yml

@@ -8,16 +8,21 @@ services:
     container_name: cloud-mcp
     restart: unless-stopped
     volumes:
-      # Mount data directory for persistent storage
-      - ./data:/app/data
       # Mount .env file if exists (optional, can use environment variables instead)
       - ./.env:/app/.env:ro
     environment:
       - NODE_ENV=production
+      # PostgreSQL connection (required)
+      # - DATABASE_URL=${DATABASE_URL}
       # Add your environment variables here or use .env file
       # - NAS_HOST=${NAS_HOST}
       # - SERVER_HOST=${SERVER_HOST}
       # etc.
+    # Note: This service requires an external PostgreSQL database.
+    # Set DATABASE_URL environment variable to connect to your PostgreSQL instance.
+    # For local development, you can uncomment the postgres service below:
+    # depends_on:
+    #   - postgres
     stdin_open: true
     tty: true
     # Health check (optional)