chore: Docker 部署配置(多阶段构建+环境模板)

- 多阶段构建 → 6.2MB 镜像

- .env.example 环境模板, 敏感配置运行时注入

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

go/docker-compose.yml

@@ -0,0 +1,22 @@
+services:
+  electric-monitor:
+    build: .
+    container_name: electric-monitor
+    restart: unless-stopped
+    ports:
+      - "8000:8000"
+    environment:
+      # 账号密码与加密密钥必须通过 .env 注入（见 .env.example）
+      LZU_USERNAME: "${LZU_USERNAME}"
+      LZU_PASSWORD: "${LZU_PASSWORD}"
+      LZU_SERVICE_ID: "${LZU_SERVICE_ID:-29615}"
+      XF_PLATFORM: "${XF_PLATFORM:-QHIT_EDU}"
+      XF_AUTH_APPID: "${XF_AUTH_APPID:-2606161276416311297}"
+      XF_SCHOOL_CODE: "${XF_SCHOOL_CODE:-10730}"
+      XF_YM_APPID: "${XF_YM_APPID:-1810181825222034}"
+      LZU_AES_KEY: "${LZU_AES_KEY}"
+      LZU_MD5_KEY: "${LZU_MD5_KEY}"
+      XF_CACHE_TTL: "${XF_CACHE_TTL:-518400}"
+      TZ: Asia/Shanghai
+    volumes:
+      - ./data:/app/data