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/achievement/views/achievement_page.dart

@@ -3,6 +3,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:nuanji_app/core/theme/app_colors.dart';
+import 'package:nuanji_app/core/theme/app_radius.dart';
 import 'package:nuanji_app/data/remote/api_client.dart';
 import '../bloc/achievement_bloc.dart';
 
@@ -129,7 +130,7 @@ class _AchievementProgressCard extends StatelessWidget {
     return Card(
       elevation: 0,
       shape: RoundedRectangleBorder(
-        borderRadius: BorderRadius.circular(22),
+        borderRadius: AppRadius.lgBorder,
       ),
       color: colorScheme.primaryContainer,
       child: Padding(
@@ -156,7 +157,7 @@ class _AchievementProgressCard extends StatelessWidget {
             ),
             const SizedBox(height: 12),
             ClipRRect(
-              borderRadius: BorderRadius.circular(8),
+              borderRadius: AppRadius.xsBorder,
               child: LinearProgressIndicator(
                 value: progress,
                 minHeight: 10,
@@ -188,7 +189,7 @@ class _AchievementCard extends StatelessWidget {
     return Card(
       elevation: 0,
       shape: RoundedRectangleBorder(
-        borderRadius: BorderRadius.circular(16),
+        borderRadius: AppRadius.mdBorder,
         side: BorderSide(
           color: achievement.isUnlocked
               ? AppColors.accent.withValues(alpha: 0.4)