feat: 添加视觉设计语言系统并重构认证页面UI

- 新增 visual_design_language.md 设计规范文档
- 新增 auth 设计 tokens (authBackground, authCard, authInput, feedback 系列等)
- 重构登录/注册/验证码/重置密码页面为新设计系统
- 新增 AuthHeroHeader, AuthSurfaceCard, AuthSection, AuthField, PasswordField 组件
- 重构 AppBanner 和 Toast 支持多类型配置 (info/success/warning/error)
- 后端 AgentScope: 重整 schemas/prompts/tools 作用域, 新增协议文档
- 更新 AGENTS.md 集成视觉设计语言约束

backend/src/v1/schedule_items/schemas.py

@@ -6,17 +6,19 @@ from uuid import UUID
 
 from pydantic import BaseModel, ConfigDict, EmailStr, Field
 
-from schemas.schedule.items import (
-    AttachmentType,
+from schemas.inbox.messages import (
     CalendarContent,
     CalendarDeleteContent,
     CalendarInviteContent,
     CalendarUpdateContent,
+    parse_calendar_content,
+)
+from schemas.schedule.items import (
+    AttachmentType,
     ScheduleItemMetadata,
     ScheduleItemMetadataAttachment,
     ScheduleItemSourceType,
     ScheduleItemStatus,
-    parse_calendar_content,
 )
 
 __all__ = [