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/searchUsers/index.js

@@ -0,0 +1,27 @@
+const cloud = require('wx-server-sdk')
+cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
+const db = cloud.database()
+const _ = db.command
+const RESULT_LIMIT = 20
+
+function escapeRegExp(s) {
+  return String(s).replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
+}
+
+exports.main = async (event, context) => {
+  const keyword = String((event && event.keyword) || '').trim()
+  if (!keyword) return { code: 0, data: [] }
+
+  try {
+    const re = db.RegExp({ regexp: escapeRegExp(keyword), options: 'i' })
+    const res = await db.collection('users')
+      .where(_.or([{ nickName: re }, { handle: re }, { location: re }]))
+      .field({ nickName: true, avatarUrl: true, bio: true, handle: true, location: true })
+      .limit(RESULT_LIMIT)
+      .get()
+
+    return { code: 0, data: res.data }
+  } catch (e) {
+    return { code: -1, message: e.message }
+  }
+}

cloudfunctions/searchUsers/package.json

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