feat: RFCP MVP deployed on VPS

Iteration 1:
- Dark theme with 3-way toggle
- Dynamic heatmap gradient (blue→red)
- Radius up to 100km
- Save & Calculate workflow

Iteration 2:
- Terrain overlay toggle
- Batch height operations
- Zoom-dependent heatmap rendering

Infrastructure:
- Backend FastAPI on 8888
- Frontend static build via Caddy
- Systemd services
- Caddy reverse proxy integration

docker-compose.yml

@@ -0,0 +1,24 @@
+version: '3.8'
+
+services:
+  rfcp-backend:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+    container_name: rfcp-backend
+    restart: unless-stopped
+    volumes:
+      - ./data/terrain:/app/data/terrain:ro
+    ports:
+      - "127.0.0.1:8090:8000"
+    environment:
+      - ENVIRONMENT=production
+
+  rfcp-frontend:
+    image: nginx:alpine
+    container_name: rfcp-frontend
+    restart: unless-stopped
+    volumes:
+      - ./frontend/dist:/usr/share/nginx/html:ro
+    ports:
+      - "127.0.0.1:3000:80"