chore: 清理冗余代码并补全私信/搜索/故事/通知功能

- 删除未使用的空组件目录、死代码导出(clearAuth/calcDistance/COLORS/
  AVATAR_GRADIENTS/Message/TabBarItem/deletePost/uploadImage/getFileURL/
  _initLogin)，确保程序仍可正常运行
- 新增 8 个云函数并补全对应页面逻辑：getMessages/sendMessage(私信聊天)、
  getHotTopics/searchPosts/searchUsers(搜索)、getStory(故事，复用 posts
  集合)、getNotifications/markAllRead(基于点赞评论聚合的通知系统)
- 在 cloudbaserc.json 中注册全部新云函数，并通过 --deployMode zip 完成部署

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

cloudfunctions/getNotifications/index.js

@@ -0,0 +1,80 @@
+const cloud = require('wx-server-sdk')
+cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
+const db = cloud.database()
+const _ = db.command
+
+// 项目暂未建立独立的通知集合，这里通过聚合"我的动态"收到的点赞 / 评论
+// 实时合成通知列表；已读状态通过用户文档上的 lastReadNotificationsAt 时间戳比对得出
+exports.main = async (event, context) => {
+  const { OPENID } = cloud.getWXContext()
+
+  try {
+    const meRes = await db.collection('users').where({ openid: OPENID }).get()
+    if (meRes.data.length === 0) return { code: 0, data: [] }
+    const me = meRes.data[0]
+    const lastRead = me.lastReadNotificationsAt ? new Date(me.lastReadNotificationsAt).getTime() : 0
+
+    const myPostsRes = await db.collection('posts')
+      .where({ authorId: OPENID })
+      .field({ _id: true })
+      .orderBy('createdAt', 'desc')
+      .limit(50)
+      .get()
+    const myPostIds = myPostsRes.data.map(p => p._id)
+
+    const items = []
+
+    if (myPostIds.length) {
+      const [likesRes, commentsRes] = await Promise.all([
+        db.collection('likes')
+          .where({ postId: _.in(myPostIds), userId: _.neq(OPENID) })
+          .orderBy('createdAt', 'desc')
+          .limit(20)
+          .get(),
+        db.collection('comments')
+          .where({ postId: _.in(myPostIds), authorId: _.neq(OPENID) })
+          .orderBy('createdAt', 'desc')
+          .limit(20)
+          .get(),
+      ])
+
+      likesRes.data.forEach(l => items.push({
+        _id: `like_${l._id}`,
+        fromId: l.userId,
+        postId: l.postId,
+        action: '点赞',
+        target: '动态',
+        createdAt: l.createdAt,
+      }))
+
+      commentsRes.data.forEach(c => items.push({
+        _id: `comment_${c._id}`,
+        fromId: c.authorId,
+        postId: c.postId,
+        action: '评论',
+        target: '动态',
+        createdAt: c.createdAt,
+      }))
+    }
+
+    items.sort((a, b) => new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime())
+    const sliced = items.slice(0, 30)
+
+    const fromIds = [...new Set(sliced.map(i => i.fromId).filter(Boolean))]
+    const usersRes = fromIds.length
+      ? await db.collection('users').where({ openid: _.in(fromIds) }).field({ openid: true, nickName: true }).get()
+      : { data: [] }
+    const nickMap = {}
+    usersRes.data.forEach(u => { nickMap[u.openid] = u.nickName })
+
+    const result = sliced.map(i => ({
+      ...i,
+      fromNick: nickMap[i.fromId] || '一位用户',
+      isRead: new Date(i.createdAt).getTime() <= lastRead,
+    }))
+
+    return { code: 0, data: result }
+  } catch (e) {
+    return { code: -1, message: e.message }
+  }
+}

cloudfunctions/getNotifications/package.json

@@ -0,0 +1 @@
+{ "name": "getNotifications", "version": "1.0.0", "main": "index.js", "dependencies": { "wx-server-sdk": "~2.1.2" } }