feat: implement MC domain filter proxy, API, dashboard

- proxy: asyncio TCP proxy with handshake parser, domain whitelist,
  transparent backend tunneling, SQLite logging, mtime hot reload
- api: FastAPI routes for config/domains/logs/status + restart trigger
- frontend: React + Vite NPM-style dashboard (dashboard/domains/logs/settings)
- nginx: reverse proxy for /api -> api:8000 and / -> frontend:3000
- docker-compose: full stack with shared data volume
- replace spec mc-domain-filter.md with README.md

docker-compose.yml

@@ -0,0 +1,49 @@
+services:
+  proxy:
+    build: ./proxy
+    container_name: mc-filter-proxy
+    ports:
+      - "25565:25565"
+    volumes:
+      - ./data:/data
+    restart: unless-stopped
+    networks:
+      - mc-filter
+
+  api:
+    build: ./api
+    container_name: mc-filter-api
+    expose:
+      - "8000"
+    volumes:
+      - ./data:/data
+    restart: unless-stopped
+    networks:
+      - mc-filter
+
+  frontend:
+    build: ./frontend
+    container_name: mc-filter-frontend
+    expose:
+      - "3000"
+    restart: unless-stopped
+    networks:
+      - mc-filter
+
+  nginx:
+    image: nginx:alpine
+    container_name: mc-filter-nginx
+    ports:
+      - "8080:80"   # 대시보드 접근 포트 (외부 포트포워딩 금지 권장)
+    volumes:
+      - ./nginx/nginx.conf:/etc/nginx/nginx.conf:ro
+    depends_on:
+      - api
+      - frontend
+    restart: unless-stopped
+    networks:
+      - mc-filter
+
+networks:
+  mc-filter:
+    driver: bridge