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/sendMessage/index.js

@@ -0,0 +1,32 @@
+const cloud = require('wx-server-sdk')
+cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
+const db = cloud.database()
+
+exports.main = async (event, context) => {
+  const { OPENID } = cloud.getWXContext()
+  const { toId, content, type = 'text' } = event || {}
+
+  if (!toId || !String(content || '').trim()) {
+    return { code: -1, message: '参数错误' }
+  }
+
+  try {
+    const meRes = await db.collection('users').where({ openid: OPENID }).get()
+    if (meRes.data.length === 0) return { code: -1, message: '用户不存在' }
+    const myId = meRes.data[0]._id
+
+    const message = {
+      fromId: myId,
+      toId,
+      content: String(content).trim(),
+      type,
+      isRead: false,
+      createdAt: db.serverDate(),
+    }
+    const res = await db.collection('messages').add({ data: message })
+
+    return { code: 0, data: { _id: res._id, ...message } }
+  } catch (e) {
+    return { code: -1, message: e.message }
+  }
+}

cloudfunctions/sendMessage/package.json

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