fix(mobile-next): 移除悬浮窗申请与位置发送，通话文案改为语音通话

同步完成后不再索取 SYSTEM_ALERT_WINDOW，去掉旧浮窗服务声明和定位权限/发送入口；历史位置消息仍只读展示。

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

mobile-next/lib/core/controller/im_controller.dart

@@ -1,12 +1,10 @@
 import 'dart:convert';
-import 'dart:io';
 
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_openim_sdk/flutter_openim_sdk.dart';
 import 'package:get/get.dart';
 import 'package:openim_common/openim_common.dart';
-import 'package:permission_handler/permission_handler.dart';
 import 'package:openim_live/openim_live.dart';
 
 import '../../company/feature_flags.dart';
@@ -236,9 +234,6 @@ class IMController extends GetxController with IMCallback, OpenIMLive {
           },
           onSyncServerFinish: (reInstall) {
             imSdkStatus(IMSdkStatus.syncEnded, reInstall: reInstall ?? false);
-            if (Platform.isAndroid) {
-              Permissions.request([Permission.systemAlertWindow]);
-            }
           },
           onSyncServerStart: (reInstall) {
             imSdkStatus(IMSdkStatus.syncStart, reInstall: reInstall ?? false);