修复聊天头像与列表：配对群元数据、排序与连接稳定（miniprogram目录）

Co-authored-by: Cursor <cursoragent@cursor.com>

miniprogram/utils/im-user.js

@@ -0,0 +1,50 @@
+/**
+ * IM 用户展示：从本地缓存读取最新头像，空则用默认图
+ */
+export function getDefaultAvatar(app) {
+  const oss = app.globalData.ossImageUrl || '';
+  return oss + (app.globalData.morentouxiang || '');
+}
+
+export function resolveAvatarUrl(raw, app) {
+  const def = getDefaultAvatar(app);
+  if (!raw) return def;
+  if (raw.startsWith('http')) return raw;
+  const oss = app.globalData.ossImageUrl || '';
+  return oss + raw.replace(/^\//, '');
+}
+
+export function getFreshImUser(app, role, uid) {
+  const prefixMap = {
+    normal: 'Boss', dashou: 'Ds', shangjia: 'Sj',
+    guanshi: 'Gs', zuzhang: 'Zz', kaoheguan: 'Kh',
+  };
+  const prefix = prefixMap[role] || 'Boss';
+  const touxiang = wx.getStorageSync('touxiang') || '';
+  const avatar = resolveAvatarUrl(touxiang, app);
+  const name = app.globalData.currentUser?.name || `用户${(uid || '').slice(-6)}`;
+  return {
+    id: prefix + uid,
+    name,
+    avatar,
+  };
+}
+
+export function persistGroupMeta(app, groupId, meta) {
+  if (!groupId || !meta) return;
+  if (!app.globalData.groupInfoMap) app.globalData.groupInfoMap = {};
+  app.globalData.groupInfoMap[groupId] = { ...app.globalData.groupInfoMap[groupId], ...meta };
+  try {
+    const cache = wx.getStorageSync('pairGroupMetaCache') || {};
+    cache[groupId] = app.globalData.groupInfoMap[groupId];
+    wx.setStorageSync('pairGroupMetaCache', cache);
+  } catch (e) {}
+}
+
+export function loadGroupMetaCache(app) {
+  try {
+    const cache = wx.getStorageSync('pairGroupMetaCache') || {};
+    if (!app.globalData.groupInfoMap) app.globalData.groupInfoMap = {};
+    Object.assign(app.globalData.groupInfoMap, cache);
+  } catch (e) {}
+}