[AI Generated]: feat(*): 完善成员下发进度提示、头像取首字、图片资源分目录及选人回填逻辑优化

miniprogram/lefu/service.ts

@@ -344,7 +344,7 @@ class LeFuService {
     }
 
     // ─── 成员同步 ─────────────────────────────────
-    syncMembersToDevice(members: DeviceMember[]): Promise<void> {
+    syncMembersToDevice(members: DeviceMember[], onProgress?: (current: number, total: number) => void): Promise<void> {
         return new Promise((resolve, reject) => {
             if (!this._activeProtocol) { reject(new Error('[LeFu] 设备未连接')); return }
             const mainUser = members.find(m => m.isSelf)
@@ -368,6 +368,7 @@ class LeFuService {
                         return
                     }
                     const member = members[index]
+                    onProgress?.(index + 1, members.length)
                     resetTimer()
                     this._activeProtocol.dataSyncUserInfo(
                         {