接入自建后端 + Gitea CI/CD

- 新增 server/：Node + Express + SQLite + node-cron 实现登录、纪念日 CRUD 和定时订阅消息推送
- 新增 .gitea/workflows/deploy.yml：推送即触发群晖 Docker 部署，监听 15002
- utils/api.js：自动按 envVersion 切换本地/线上 BASE_URL
- app.js 与 add-anniversary.js 移除 wx.cloud 调用，改走自建后端
- cloudfunctions/ 暂保留以便回滚
- 一并提交此前未入库的首页 / 设置页 / 日历 / 万年历等改造

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

project.config.json

@@ -34,10 +34,12 @@
     "disableSWC": true
   },
   "compileType": "miniprogram",
-  "libVersion": "3.0.0",
-  "appid": "touristappid",
+  "libVersion": "3.10.3",
+  "appid": "wxe72882e2072d141a",
   "projectname": "birthday-reminder",
+  "cloudfunctionRoot": "cloudfunctions/",
   "condition": {},
   "simulatorPluginLibVersion": {},
-  "editorSetting": {}
+  "editorSetting": {},
+  "cloudfunctionTemplateRoot": "cloudfunctionTemplate/"
 }