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.wxml

@@ -5,6 +5,11 @@
 <view class="home-fixed-header"><view class="home-fixed-heading" style="height:{{barHeight}}px;padding-right:{{navSide}}px;"><text class="j-eyebrow">OUR LITTLE WORLD</text><view class="home-handwritten-title"><text class="j-page-title">让所有的爱有迹可循</text></view></view></view>
 <scroll-view class="page-bg home-scroll" scroll-y show-scrollbar="{{false}}" refresher-enabled="{{true}}" refresher-triggered="{{refreshing}}" bindrefresherrefresh="onRefresh" bindscroll="onScroll" scroll-top="{{scrollTop}}">
 <view class="j-body home-body">
+<view class="home-greeting">
+  <text class="home-greeting-date">{{greetingDate}}</text>
+  <text class="home-greeting-title">{{greetingText}}，{{partner1Name && partner1Name !== '?' ? partner1Name : '亲爱的'}}</text>
+  <text class="home-greeting-note">{{greetingNote}}</text>
+</view>
 <page-state wx:if="{{homeError}}" kind="error" title="首页加载失败" description="请检查网络后重新加载" action="重试" bind:action="loadData" />
 <page-state wx:elif="{{!relationshipKnown}}" kind="loading" title="正在打开你的空间" />
 <view wx:else class="j-cover">