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>

pages/add-anniversary/add-anniversary.wxss

@@ -6,7 +6,7 @@
 }
 
 .form {
-  padding: 32rpx;
+  padding: 0 32rpx 32rpx;
 }
 
 .form-item {
@@ -15,6 +15,11 @@
   padding: 32rpx;
   margin-bottom: 24rpx;
   box-shadow: 0 2rpx 12rpx rgba(0, 0, 0, 0.06);
+  box-sizing: border-box;
+}
+
+.form-item:first-child {
+  margin-top: 6rpx;
 }
 
 .label {
@@ -100,36 +105,57 @@
 }
 
 .textarea {
+  width: 100%;
   background-color: #f5f5f5;
   border-radius: 8rpx;
   padding: 24rpx;
   font-size: 28rpx;
   min-height: 160rpx;
+  box-sizing: border-box;
 }
 
 .buttons {
   display: flex;
   gap: 24rpx;
   margin-top: 40rpx;
+  padding: 0 32rpx 32rpx;
 }
 
 .btn {
   flex: 1;
-  height: 88rpx;
-  line-height: 88rpx;
-  border-radius: 16rpx;
+  height: 96rpx;
+  line-height: 96rpx;
+  border-radius: 48rpx;
   font-size: 32rpx;
+  font-weight: 600;
   border: none;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+  box-shadow: 0 4rpx 16rpx rgba(0, 0, 0, 0.1);
 }
 
 .btn-cancel {
-  background-color: #f5f5f5;
+  background: linear-gradient(135deg, #f5f7fa 0%, #e8eaf0 100%);
   color: #666;
+  border: 2rpx solid rgba(102, 126, 234, 0.2);
+}
+
+.btn-cancel:active {
+  transform: scale(0.98);
+  box-shadow: 0 2rpx 8rpx rgba(0, 0, 0, 0.08);
 }
 
 .btn-submit {
-  background: linear-gradient(135deg, #07c160 0%, #06ad56 100%);
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
   color: #fff;
+  box-shadow: 0 8rpx 24rpx rgba(102, 126, 234, 0.4);
+}
+
+.btn-submit:active {
+  transform: scale(0.98);
+  box-shadow: 0 4rpx 16rpx rgba(102, 126, 234, 0.3);
 }
 
 .btn-cancel::after,