feat(app): 初始化 Flutter 前端项目 (Phase F0)

- Flutter 3.44.0 + Dart 3.12.0
- 设计系统: 7色Token×浅/深模式, NotoSansSC/Caveat字体, 圆角10/16/22/28/pill, 三级阴影
- ResponsiveScaffold: 手机底部TabBar / 平板侧边Rail / 桌面三栏
- go_router 路由表: 13个页面 (5个Tab + 8个全屏页面)
- 13个功能模块占位页面 (home/calendar/mood/search/profile/editor/auth/class/teacher/parent/achievement/stickers/templates)
- 依赖: flutter_bloc, go_router, freezed, isar, dio, perfect_freehand, fl_chart
- 中国镜像: PUB_HOSTED_URL + FLUTTER_STORAGE_BASE_URL
- flutter analyze: No issues found

app/lib/features/achievement/views/achievement_page.dart

@@ -0,0 +1,14 @@
+import 'package:flutter/material.dart';
+
+class AchievementPage extends StatelessWidget {
+  const AchievementPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Scaffold(
+      body: Center(
+        child: Text('成就 - 占位页面'),
+      ),
+    );
+  }
+}

app/lib/features/auth/views/login_page.dart

@@ -0,0 +1,14 @@
+import 'package:flutter/material.dart';
+
+class LoginPage extends StatelessWidget {
+  const LoginPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Scaffold(
+      body: Center(
+        child: Text('登录 - 占位页面'),
+      ),
+    );
+  }
+}

app/lib/features/calendar/views/calendar_page.dart

@@ -0,0 +1,14 @@
+import 'package:flutter/material.dart';
+
+class CalendarPage extends StatelessWidget {
+  const CalendarPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Scaffold(
+      body: Center(
+        child: Text('日历 - 占位页面'),
+      ),
+    );
+  }
+}

app/lib/features/class_/views/class_page.dart

@@ -0,0 +1,14 @@
+import 'package:flutter/material.dart';
+
+class ClassPage extends StatelessWidget {
+  const ClassPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Scaffold(
+      body: Center(
+        child: Text('班级 - 占位页面'),
+      ),
+    );
+  }
+}

app/lib/features/editor/views/editor_page.dart

@@ -0,0 +1,20 @@
+import 'package:flutter/material.dart';
+
+class EditorPage extends StatelessWidget {
+  final String? journalId;
+
+  const EditorPage({super.key, this.journalId});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Center(
+        child: Text(
+          journalId != null
+              ? '编辑日记 ($journalId) - 占位页面'
+              : '新建日记 - 占位页面',
+        ),
+      ),
+    );
+  }
+}

app/lib/features/home/views/home_page.dart

@@ -0,0 +1,14 @@
+import 'package:flutter/material.dart';
+
+class HomePage extends StatelessWidget {
+  const HomePage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Scaffold(
+      body: Center(
+        child: Text('首页 - 占位页面'),
+      ),
+    );
+  }
+}

app/lib/features/mood/views/mood_page.dart

@@ -0,0 +1,14 @@
+import 'package:flutter/material.dart';
+
+class MoodPage extends StatelessWidget {
+  const MoodPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Scaffold(
+      body: Center(
+        child: Text('心情 - 占位页面'),
+      ),
+    );
+  }
+}

app/lib/features/parent/views/parent_page.dart

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+import 'package:flutter/material.dart';
+
+class ParentPage extends StatelessWidget {
+  const ParentPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Scaffold(
+      body: Center(
+        child: Text('家长 - 占位页面'),
+      ),
+    );
+  }
+}

app/lib/features/profile/views/profile_page.dart

@@ -0,0 +1,14 @@
+import 'package:flutter/material.dart';
+
+class ProfilePage extends StatelessWidget {
+  const ProfilePage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Scaffold(
+      body: Center(
+        child: Text('我的 - 占位页面'),
+      ),
+    );
+  }
+}

app/lib/features/search/views/search_page.dart

@@ -0,0 +1,14 @@
+import 'package:flutter/material.dart';
+
+class SearchPage extends StatelessWidget {
+  const SearchPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Scaffold(
+      body: Center(
+        child: Text('搜索 - 占位页面'),
+      ),
+    );
+  }
+}

app/lib/features/stickers/views/sticker_library_page.dart

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+import 'package:flutter/material.dart';
+
+class StickerLibraryPage extends StatelessWidget {
+  const StickerLibraryPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Scaffold(
+      body: Center(
+        child: Text('贴纸库 - 占位页面'),
+      ),
+    );
+  }
+}

app/lib/features/teacher/views/teacher_page.dart

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+import 'package:flutter/material.dart';
+
+class TeacherPage extends StatelessWidget {
+  const TeacherPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Scaffold(
+      body: Center(
+        child: Text('教师 - 占位页面'),
+      ),
+    );
+  }
+}

app/lib/features/templates/views/template_gallery_page.dart

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+import 'package:flutter/material.dart';
+
+class TemplateGalleryPage extends StatelessWidget {
+  const TemplateGalleryPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Scaffold(
+      body: Center(
+        child: Text('模板画廊 - 占位页面'),
+      ),
+    );
+  }
+}