feat(mobile-next): 导入官方 openim-flutter-demo 固定基线 3.8.3-patch.3 并完成双构建

- 上游: github.com/OpenIMSDK/openim-flutter-demo tag 3.8.3-patch.3
  commit b3dfdb1e8aaeaaf6f0793e10cadd20d5c184a31f
- 并行目录 mobile-next/ 原样导入（含 LICENSE），不覆盖现网 mobile/
- 锁定 Flutter 3.24.5 / Dart 3.5.4 / JDK 17 / Gradle 7.6.3 / AGP 7.3.1
- 实测 Android debug 与 release 构建均成功（见 docs/mobile-next-baseline-import.md）
- 本提交可单独回退：git revert 1db1229（重写前）

Co-authored-by: multica-agent <github@multica.ai>

mobile-next/lib/pages/global_search/global_search_binding.dart

@@ -0,0 +1,10 @@
+import 'package:get/get.dart';
+
+import 'global_search_logic.dart';
+
+class GlobalSearchBinding extends Bindings {
+  @override
+  void dependencies() {
+    Get.lazyPut(() => GlobalSearchLogic());
+  }
+}

mobile-next/lib/pages/global_search/global_search_logic.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_openim_sdk/flutter_openim_sdk.dart';
+import 'package:get/get.dart';
+import 'package:openim_common/openim_common.dart';
+import 'package:pull_to_refresh_new/pull_to_refresh.dart';
+
+import '../conversation/conversation_logic.dart';
+
+class GlobalSearchLogic extends CommonSearchLogic {
+  final conversationLogic = Get.find<ConversationLogic>();
+  final textMessageRefreshCtrl = RefreshController();
+  final fileMessageRefreshCtrl = RefreshController();
+  final contactsList = <dynamic>[].obs;
+  final groupList = <GroupInfo>[].obs;
+  final textSearchResultItems = <SearchResultItems>[].obs;
+
+  final fileMessageList = <Message>[].obs;
+  final index = 0.obs;
+  final tabs = [
+    StrRes.globalSearchAll,
+    StrRes.globalSearchContacts,
+    StrRes.globalSearchGroup,
+    StrRes.globalSearchChatHistory,
+    StrRes.globalSearchChatFile,
+  ];
+
+  int textMessagePageIndex = 1;
+  int fileMessagePageIndex = 1;
+  int count = 20;
+
+  switchTab(int index) {
+    this.index.value = index;
+  }
+
+  @override
+  void clearList() {
+    contactsList.clear();
+    groupList.clear();
+    textSearchResultItems.clear();
+    fileMessageList.clear();
+  }
+}
+
+abstract class CommonSearchLogic extends GetxController {
+  final searchCtrl = TextEditingController();
+  final focusNode = FocusNode();
+
+  void clearList();
+
+  @override
+  void onInit() {
+    searchCtrl.addListener(_clearInput);
+    super.onInit();
+  }
+
+  @override
+  void onClose() {
+    focusNode.dispose();
+    searchCtrl.dispose();
+    super.onClose();
+  }
+
+  _clearInput() {
+    if (searchKey.isEmpty) {
+      clearList();
+    }
+  }
+
+  String get searchKey => searchCtrl.text.trim();
+
+  Future<List<FriendInfo>> searchFriend() => Apis.searchFriendInfo(searchCtrl.text.trim())
+      .then((list) => list.map((e) => FriendInfo.fromJson(e.toJson())).toList());
+
+  Future<List<GroupInfo>> searchGroup() => OpenIM.iMManager.groupManager
+      .searchGroups(keywordList: [searchCtrl.text.trim()], isSearchGroupName: true, isSearchGroupID: true);
+
+  Future<SearchResult> searchTextMessage({
+    int pageIndex = 1,
+    int count = 20,
+  }) =>
+      OpenIM.iMManager.messageManager.searchLocalMessages(
+        keywordList: [searchKey],
+        messageTypeList: [MessageType.text, MessageType.atText],
+        pageIndex: pageIndex,
+        count: count,
+      );
+
+  Future<SearchResult> searchFileMessage({
+    int pageIndex = 1,
+    int count = 20,
+  }) =>
+      OpenIM.iMManager.messageManager.searchLocalMessages(
+        keywordList: [searchKey],
+        messageTypeList: [MessageType.file],
+        pageIndex: pageIndex,
+        count: count,
+      );
+
+  String? parseID(e) {
+    if (e is ConversationInfo) {
+      return e.isSingleChat ? e.userID : e.groupID;
+    } else if (e is GroupInfo) {
+      return e.groupID;
+    } else if (e is UserInfo) {
+      return e.userID;
+    } else if (e is FriendInfo) {
+      return e.userID;
+    } else {
+      return null;
+    }
+  }
+
+  String? parseNickname(e) {
+    if (e is ConversationInfo) {
+      return e.showName;
+    } else if (e is GroupInfo) {
+      return e.groupName;
+    } else if (e is UserInfo) {
+      return e.nickname;
+    } else if (e is FriendInfo) {
+      return e.nickname;
+    } else {
+      return null;
+    }
+  }
+
+  String? parseFaceURL(e) {
+    if (e is ConversationInfo) {
+      return e.faceURL;
+    } else if (e is GroupInfo) {
+      return e.faceURL;
+    } else if (e is UserInfo) {
+      return e.faceURL;
+    } else if (e is FriendInfo) {
+      return e.faceURL;
+    } else {
+      return null;
+    }
+  }
+}

mobile-next/lib/pages/global_search/global_search_view.dart

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+import 'package:flutter/material.dart';
+import 'package:get/get.dart';
+import 'package:openim_common/openim_common.dart';
+
+import 'global_search_logic.dart';
+
+class GlobalSearchPage extends StatelessWidget {
+  final logic = Get.find<GlobalSearchLogic>();
+
+  GlobalSearchPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return TouchCloseSoftKeyboard(child: Scaffold());
+  }
+}