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/openim_live/lib/src/live_controller.dart

@@ -1,6 +1,5 @@
 import 'dart:async';
 import 'dart:convert';
-import 'dart:io';
 
 import 'package:collection/collection.dart';
 import 'package:flutter/services.dart';
@@ -100,13 +99,6 @@ mixin OpenIMLive {
             final callType = mediaType == 'audio' ? CallType.audio : CallType.video;
             final callObj = sessionType == ConversationType.single ? CallObj.single : CallObj.group;
 
-            if (Platform.isAndroid && _isRunningBackground) {
-              _beCalledEvent = event;
-              if (await Permissions.checkSystemAlertWindow()) {
-                return;
-              }
-            }
-            _beCalledEvent = null;
             OpenIMLiveClient().start(
               Get.overlayContext!,
               callEventSubject: signalingSubject,