chore(deployment): add docker-compose and nginx setup for production

- Added Dockerfile and nginx.conf for frontend production build.
- Added docker-compose.yml to orchestrate backend and frontend.
- Updated geminiService.ts to support relative API paths via Nginx proxy.
- Updated documentation with deployment instructions for Synology/Docker.

docker-compose.yml

@@ -0,0 +1,38 @@
+version: '3.8'
+
+services:
+  backend:
+    build: 
+      context: .
+      dockerfile: Dockerfile
+    container_name: market-intel-backend
+    restart: unless-stopped
+    volumes:
+      # Persist Logs
+      - ./Log:/app/Log
+      # API Keys & Config (Bind Mounts for easy editing)
+      - ./gemini_api_key.txt:/app/gemini_api_key.txt
+      - ./serpapikey.txt:/app/serpapikey.txt
+      - ./config.py:/app/config.py
+      # Optional: Mount Python script for hot-reloading logic changes
+      - ./market_intel_orchestrator.py:/app/market_intel_orchestrator.py
+    environment:
+      - PYTHONUNBUFFERED=1
+    # Backend port is internal-only, accessed by frontend via Docker network
+    expose:
+      - "3001"
+
+  frontend:
+    build:
+      context: ./general-market-intelligence
+      dockerfile: Dockerfile
+    container_name: market-intel-frontend
+    restart: unless-stopped
+    ports:
+      # Expose Frontend to Host (Synology)
+      # Access via http://<Synology-IP>:8085
+      - "8085:80"
+    depends_on:
+      - backend
+
+# Optional: Define a specific network if needed, otherwise 'default' is fine.