feat: require couple binding and refine miniapp settings

Gate record features and storage entry points with invitation guidance; enforce record access in the backend. Add homepage greetings, right-swipe profile dismissal, and move the smoking switch to settings. Simplify API base configuration and remove the unused legacy tab bar component.

weapp/pages/index/index.wxss

@@ -57,3 +57,11 @@
 .home-has-background .home-couple-panel { padding:24rpx; border:1rpx solid rgba(233,221,208,.65); border-radius:24rpx; background:rgba(255,253,248,.82); }
 
 .notice-overlay {position:fixed;inset:0;z-index:12000;display:flex;align-items:center;justify-content:center;background:rgba(49,36,42,.46);padding:48rpx;box-sizing:border-box;}.notice-dialog{width:100%;max-width:640rpx;background:#FFFCF8;border-radius:36rpx;padding:44rpx;box-sizing:border-box;}.notice-label{display:block;color:#9B7B83;font-size:22rpx;}.notice-title{display:block;font-size:36rpx;color:#64424D;margin:16rpx 0 28rpx;}.notice-content{max-height:50vh;white-space:pre-wrap;font-size:28rpx;line-height:1.8;color:#5F5557;}.notice-dismiss{margin-top:32rpx;background:#667E75;color:#fff;border-radius:20rpx;font-size:28rpx;}
+
+/* 首页问候沿用手账字体与柔和玫瑰色，随正文一起滚动。 */
+.home-greeting { margin:0 0 48rpx; padding:0 4rpx; }
+.home-greeting-date { display:block; color:#9C747F; font-size:24rpx; line-height:1.6; letter-spacing:1rpx; }
+.home-greeting-title { display:block; color:#A44E6B; font-size:44rpx; line-height:1.45; margin-top:8rpx; overflow-wrap:break-word; word-break:break-all; }
+.home-greeting-note { display:block; color:#948179; font-size:25rpx; line-height:1.7; margin-top:10rpx; }
+.home-has-background .home-greeting { background:rgba(255,253,248,.86); border-radius:24rpx; padding:24rpx 28rpx; }
+@media (max-width:350px) { .home-greeting-title { font-size:38rpx; } }