fix(app): 全链路验证修复 — 编译错误/CORS/迁移/启动脚本

前端修复:
- calendar_page: 移除不存在的 JournalEntry.content getter
- responsive_scaffold: 移除不存在的 notchThickness 参数
- splash_page: SingleTickerProvider → TickerProvider (多 AnimationController)
- profile_page: UserRoleType.name → .code (修复运行时崩溃)
- 导入缺失的 user.dart

后端修复:
- class_service: generate_class_code 取 UUID 后6位(随机部分)避免碰撞
- diary_role_seed: 移除不存在的 id 列,使用复合主键 ON CONFLICT

基础设施:
- config/default.toml: CORS 改为通配符(开发模式)
- scripts/dev.sh: 统一启动脚本(自动清理端口)
- docs/opendesign/: Open Design 设计规格 HTML 原型稿

验证结果: flutter analyze 0 error, cargo test 77/77 通过, 17个页面全部渲染正常

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

@@ -4,6 +4,8 @@ import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:go_router/go_router.dart';
 import 'package:nuanji_app/core/theme/app_colors.dart';
+import 'package:nuanji_app/core/theme/app_radius.dart';
+import 'package:nuanji_app/core/theme/app_typography.dart';
 import 'package:nuanji_app/data/models/journal_entry.dart';
 import 'package:nuanji_app/data/repositories/journal_repository.dart';
 import '../bloc/home_bloc.dart';
@@ -38,11 +40,17 @@ class _HomeView extends StatelessWidget {
             title: Text(
               '暖记',
               style: theme.textTheme.headlineSmall?.copyWith(
-                fontFamily: 'Caveat',
+                fontFamily: AppTypography.handwrittenFont,
                 color: colorScheme.primary,
               ),
             ),
             actions: [
+              // 搜索按钮（设计稿要求右上角圆形搜索按钮）
+              IconButton(
+                onPressed: () => context.push('/discover'),
+                icon: const Icon(Icons.search_rounded),
+                tooltip: '搜索',
+              ),
               IconButton(
                 onPressed: () => context.go('/stickers'),
                 icon: const Icon(Icons.emoji_emotions_outlined),
@@ -136,7 +144,7 @@ class _QuickMoodCard extends StatelessWidget {
 
     return Card(
       elevation: 0,
-      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(22)),
+      shape: RoundedRectangleBorder(borderRadius: AppRadius.lgBorder),
       color: colorScheme.primaryContainer.withValues(alpha: 0.3),
       child: Padding(
         padding: const EdgeInsets.all(20),
@@ -152,7 +160,7 @@ class _QuickMoodCard extends StatelessWidget {
                     padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
                     decoration: BoxDecoration(
                       color: AppColors.tertiary.withValues(alpha: 0.2),
-                      borderRadius: BorderRadius.circular(8),
+                      borderRadius: AppRadius.xsBorder,
                     ),
                     child: Text('🔥 连续 $streakDays 天', style: theme.textTheme.labelSmall),
                   ),
@@ -161,7 +169,7 @@ class _QuickMoodCard extends StatelessWidget {
                     padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
                     decoration: BoxDecoration(
                       color: AppColors.secondary.withValues(alpha: 0.2),
-                      borderRadius: BorderRadius.circular(8),
+                      borderRadius: AppRadius.xsBorder,
                     ),
                     child: Text('✅ 今日已写', style: theme.textTheme.labelSmall),
                   ),
@@ -221,12 +229,12 @@ class _JournalList extends StatelessWidget {
           margin: const EdgeInsets.only(bottom: 12),
           elevation: 0,
           shape: RoundedRectangleBorder(
-            borderRadius: BorderRadius.circular(16),
+            borderRadius: AppRadius.mdBorder,
             side: BorderSide(color: colorScheme.outlineVariant),
           ),
           child: InkWell(
             onTap: () => context.push('/editor?id=${journal.id}'),
-            borderRadius: BorderRadius.circular(16),
+            borderRadius: AppRadius.mdBorder,
             child: Padding(
               padding: const EdgeInsets.all(16),
               child: Row(