feat: 添加 Gitea webhook 自动部署功能

- 新增独立的 webhook 服务 (Go, 端口 9000)
- HMAC-SHA256 签名验证
- 零停机热更新部署
- 自动清理旧镜像
- 完整配置文档 WEBHOOK_SETUP.md
- 精简 README 版本历史为表格形式

docker-compose.yaml

@@ -125,3 +125,31 @@ services:
     depends_on:
       mongodb:
         condition: service_healthy
+
+  # Gitea Webhook 服务 - 自动部署
+  webhook:
+    build:
+      context: ./webhook
+      dockerfile: Dockerfile
+    container_name: billai-webhook
+    restart: unless-stopped
+    ports:
+      - "9000:9000"
+    environment:
+      WEBHOOK_PORT: "9000"
+      # 重要：更改此 Secret 为强随机值
+      # 生成方法: openssl rand -hex 32
+      WEBHOOK_SECRET: "change-this-to-your-secret-key"
+      REPO_PATH: "/app"
+    volumes:
+      # 挂载 Docker Socket 以支持容器操作
+      - /var/run/docker.sock:/var/run/docker.sock
+      # 挂载仓库目录
+      - /path/to/billai:/app
+    working_dir: /app
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:9000/health"]
+      interval: 10s
+      timeout: 5s
+      retries: 3
+      start_period: 5s