chore(devops): docker-compose dev + prod, Dockerfiles, nginx, Makefile

- backend/Dockerfile: Python 3.12 slim, non-root user, WeasyPrint system deps
- backend/Dockerfile.dev: dev variant with hot-reload support
- frontend/Dockerfile: Node 20 alpine build + nginx:alpine serve
- frontend/nginx.conf: SPA routing + /api proxy to backend:8000
- docker-compose.yml: production with healthcheck
- docker-compose.dev.yml: dev with volume mounts and hot-reload
- Makefile: dev, build, up, down, logs, migrate, test, shell, prod targets
- .dockerignore for backend and frontend

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,25 @@
+services:
+  backend:
+    build: ./backend
+    restart: unless-stopped
+    volumes:
+      - ./backend/data:/app/data
+    environment:
+      - DATABASE_URL=sqlite+aiosqlite:///./data/roaauto.db
+      - SECRET_KEY=${SECRET_KEY}
+      - SMSAPI_TOKEN=${SMSAPI_TOKEN:-}
+      - CORS_ORIGINS=https://roaauto.romfast.ro
+    healthcheck:
+      test: ["CMD-SHELL", "curl -f http://localhost:8000/api/health || exit 1"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+  frontend:
+    build: ./frontend
+    restart: unless-stopped
+    ports:
+      - "80:80"
+    depends_on:
+      backend:
+        condition: service_healthy