feat: chat integration, tenant admin spec, backend chat service, miniprogram updates, DEMO moved to tmp, XCX-TEST removed, migrations & docs

tmp/DEMO-miniprogram/miniprogram/custom-tab-bar/index.json

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+{
+  "component": true,
+  "usingComponents": {}
+}

tmp/DEMO-miniprogram/miniprogram/custom-tab-bar/index.ts

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+/**
+ * 自定义 tabBar 组件
+ *
+ * 微信 custom-tab-bar 机制：tabBar 页面由框架自动挂载；
+ * 非 tabBar 页面（如 board-customer/board-coach）可手动引用。
+ *
+ * 支持 2/3 按钮动态布局，权限数据由外部注入（当前 mock 为 3 按钮）。
+ */
+
+/** tab 路由映射（key → url + 是否为 tabBar 页面） */
+const TAB_ROUTES: Record<string, { url: string; isTabBarPage: boolean }> = {
+  task: { url: '/pages/task-list/task-list', isTabBarPage: true },
+  board: { url: '/pages/board-finance/board-finance', isTabBarPage: true },
+  my: { url: '/pages/my-profile/my-profile', isTabBarPage: true },
+}
+
+// TODO: 联调时从全局状态/接口获取权限，过滤可见 tab
+// 示例：const visibleKeys = getApp().globalData.visibleTabs || ['task', 'board', 'my']
+const VISIBLE_KEYS = ['task', 'board', 'my']
+
+/** 根据权限过滤后的 tab 列表 */
+const TABS = [
+  { key: 'task', label: '任务', icon: '/assets/icons/tab-task-nav.svg', activeIcon: '/assets/icons/tab-task-nav-active.svg' },
+  { key: 'board', label: '看板', icon: '/assets/icons/tab-board-nav.svg', activeIcon: '/assets/icons/tab-board-nav-active.svg' },
+  { key: 'my', label: '我的', icon: '/assets/icons/tab-my-nav.svg', activeIcon: '/assets/icons/tab-my-nav-active.svg' },
+].filter((t) => VISIBLE_KEYS.includes(t.key))
+
+Component({
+  properties: {
+    /** 当前激活的 tab key */
+    active: {
+      type: String,
+      value: '',
+    },
+  },
+
+  data: {
+    tabs: TABS,
+    tabCount: TABS.length,
+  },
+
+  methods: {
+    onTap(e: WechatMiniprogram.TouchEvent) {
+      const key = e.currentTarget.dataset.key as string
+      // 通过 properties 获取 active，避免 this.data 类型推断问题
+      if (key === (this as unknown as { data: { active: string } }).data.active) return
+
+      const route = TAB_ROUTES[key]
+      if (!route) return
+
+      if (route.isTabBarPage) {
+        wx.switchTab({ url: route.url })
+      } else {
+        wx.navigateTo({ url: route.url })
+      }
+    },
+  },
+})

tmp/DEMO-miniprogram/miniprogram/custom-tab-bar/index.wxml

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+<!-- 自定义 tabBar — 支持 2/3 按钮动态布局 -->
+<view class="tab-bar tab-bar--{{tabCount}}">
+  <view
+    wx:for="{{tabs}}"
+    wx:key="key"
+    class="tab-bar-item {{active === item.key ? 'tab-bar-item--active' : ''}}"
+    bindtap="onTap"
+    data-key="{{item.key}}"
+  >
+    <image
+      class="tab-bar-icon"
+      src="{{active === item.key ? item.activeIcon : item.icon}}"
+      mode="aspectFit"
+    />
+    <text class="tab-bar-label">{{item.label}}</text>
+  </view>
+</view>

tmp/DEMO-miniprogram/miniprogram/custom-tab-bar/index.wxss

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+/* 自定义 tabBar — 统一底部导航样式 */
+.tab-bar {
+  position: fixed;
+  bottom: 0;
+  left: 0;
+  right: 0;
+  display: flex;
+  align-items: center;
+  height: 100rpx;
+  background: #ffffff;
+  border-top: 1rpx solid #eeeeee;
+  padding-bottom: env(safe-area-inset-bottom);
+  z-index: 999;
+}
+
+/* 3 按钮：等宽三分 */
+.tab-bar--3 .tab-bar-item {
+  flex: 1;
+}
+
+/* 2 按钮：各占一半，内容居中 */
+.tab-bar--2 .tab-bar-item {
+  width: 50%;
+  flex: none;
+}
+
+.tab-bar-item {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 4rpx;
+  height: 100%;
+}
+
+.tab-bar-icon {
+  width: 44rpx;
+  height: 44rpx;
+}
+
+.tab-bar-label {
+  font-size: 20rpx;
+  color: #8b8b8b;
+}
+
+.tab-bar-item--active .tab-bar-label {
+  color: #0052d9;
+  font-weight: 500;
+}