feat: 旅行伙伴发放与编组、修复退登卡死、优化宽屏布局、加 CI

自动退出登录卡死：_performLogoutAndExit 只 pop() 一层，而解锁/收藏品页是 push
在 HomePage 之上的，退登后被弹回「风险」hub，同时 _loggingOut 仍为 true，
PopScope(canPop:false) + 返回键转圈形成死局。改为 popUntil(isFirst)。

旅行伙伴发不了：它是 ItemKind.Character = 9，与搭档 Partner = 10 是两种东西，
原先收藏品的类型列表 [1,2,3,10,11,12] 里根本没有 9。按客户端实现，角色不走
userItemList(ExportUserItems 不导出 itemKind 9)，而是
upsertUserAll.userCharacterList 的 {characterId, level, awakening, useCount}，
配 isNewCharacterList 一行一字符。新增发放与 5 槽 charaSlot 编组页，
含「把槽 0 复制到其他槽位」，并校验所选角色确为已拥有或本次待发放。

宽屏布局：各页只有 ConstrainedBox 限宽、没有居中容器，1440 窗口下内容贴左、
右侧大片空白。抽出 responsiveBody 统一居中；B50 预览改用按宽度适配
(InteractiveViewer constrained:false + FittedBox fitWidth)，横屏下不再被
contain 缩成中间一小块，导出仍是原始 1762x1850。

CI：.github/workflows/build.yml 先跑 analyze+test 作为门槛，再产出
Windows exe、Android apk、iOS 未签名 ipa(macOS runner，无证书故不可安装)。
README 从 Flutter 模板改写为实际文档，含 path_provider/jni 与 JBR jlink
两个构建环境坑的说明。

test/music_risk_list_test.dart

@@ -0,0 +1,120 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:ichino/config/strings.dart';
+import 'package:ichino/config/title_server_config.dart';
+import 'package:ichino/pages/music_risk_feature_view.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+Future<void> _seedConfig() async {
+  SharedPreferences.setMockInitialValues({});
+  await TitleServerConfigHolder().update(
+    const TitleServerConfig(
+      titleServerUrl: 'http://127.0.0.1:9999',
+      aesKey: '0123456789abcdef',
+      aesIv: '0123456789abcdef',
+      clientId: 'A63E01C2805',
+    ),
+  );
+}
+
+Future<void> _pumpView(WidgetTester tester, MusicRiskFeatureMode mode) async {
+  await _seedConfig();
+  await tester.pumpWidget(
+    MaterialApp(
+      home: Scaffold(
+        body: MusicRiskFeatureView(
+          userId: 123,
+          cookies: 'JSESSIONID=X',
+          loginDateTime: 1,
+          loginId: 2,
+          mode: mode,
+          featureTitle: 't',
+          featureDesc: 'd',
+          onExitToTitle: () async {},
+        ),
+      ),
+    ),
+  );
+  await tester.pump();
+}
+
+Future<void> _addById(WidgetTester tester, String label, String id) async {
+  await tester.enterText(find.widgetWithText(TextField, label), id);
+  await tester.tap(find.text(AppStrings.listAddButton).first);
+  await tester.pump();
+}
+
+void main() {
+  setUp(() => addTearDown(TitleServerConfigHolder().clear));
+
+  testWidgets('收藏品列表可累加多行并可移除', (tester) async {
+    await _pumpView(tester, MusicRiskFeatureMode.collectibles);
+
+    expect(find.textContaining(AppStrings.collectiblesPendingEmpty), findsOne);
+
+    await _addById(tester, AppStrings.collectiblesItemIdLabel, '250103');
+    await _addById(tester, AppStrings.collectiblesItemIdLabel, '30021');
+
+    expect(find.textContaining('#250103'), findsOneWidget);
+    expect(find.textContaining('#30021'), findsOneWidget);
+    expect(
+      find.textContaining('${AppStrings.collectiblesPendingTitle} (2)'),
+      findsOneWidget,
+    );
+
+    // 同一类型同一 ID 不应重复入列。
+    await _addById(tester, AppStrings.collectiblesItemIdLabel, '30021');
+    expect(
+      find.textContaining('${AppStrings.collectiblesPendingTitle} (2)'),
+      findsOneWidget,
+    );
+
+    await tester.tap(find.byTooltip(AppStrings.listRemoveTooltip).first);
+    await tester.pump();
+    expect(find.textContaining('#250103'), findsNothing);
+    expect(
+      find.textContaining('${AppStrings.collectiblesPendingTitle} (1)'),
+      findsOneWidget,
+    );
+  });
+
+  testWidgets('解锁列表按勾选展开难度且添加后清空输入', (tester) async {
+    await _pumpView(tester, MusicRiskFeatureMode.unlockMusic);
+
+    await tester.enterText(
+      find.widgetWithText(TextField, AppStrings.unlockMusicIdLabel),
+      '834',
+    );
+    await tester.tap(find.text(AppStrings.unlockMusicOption).first);
+    await tester.tap(find.text(AppStrings.unlockMasterOption).first);
+    await tester.pump();
+    await tester.tap(find.text(AppStrings.listAddButton).first);
+    await tester.pump();
+
+    final row = find.textContaining('#834');
+    expect(row, findsOneWidget);
+    expect(tester.widget<Text>(row.first).data, contains('Master'));
+    // 添加后输入与勾选应被清空，方便连续添加下一条。
+    expect(
+      tester.widget<TextField>(
+        find.widgetWithText(TextField, AppStrings.unlockMusicIdLabel),
+      ).controller!.text,
+      isEmpty,
+    );
+  });
+
+  testWidgets('自动退出登录并返回标题页默认勾选', (tester) async {
+    await _pumpView(tester, MusicRiskFeatureMode.collectibles);
+
+    expect(
+      find.text(AppStrings.autoLogoutAndExit),
+      findsOneWidget,
+    );
+    // 未勾选任何解锁项时，唯一处于选中态的复选框就是自动退登。
+    final checked = tester
+        .widgetList<Checkbox>(find.byType(Checkbox))
+        .where((c) => c.value == true)
+        .toList();
+    expect(checked, hasLength(1));
+  });
+}