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

docs/protocols/profiles.md

@@ -0,0 +1,88 @@
+# Profiles Protocol
+
+> **NOTE**: This document is the single source of truth. All implementations must follow this specification.
+
+## Overview
+
+User profile settings with privacy and notification preferences.
+
+## Version
+
+- **Current**: `1.0`
+- **Status**: Active
+
+---
+
+## Preference Settings
+
+### Privacy
+
+```typescript
+interface PrivacySettings {
+  show_email?: boolean;
+  show_online_status?: boolean;
+}
+```
+
+### Notification
+
+```typescript
+interface NotificationSettings {
+  friend_request?: boolean;
+  calendar_invite?: boolean;
+  calendar_update?: boolean;
+  calendar_delete?: boolean;
+  system_message?: boolean;
+}
+```
+
+---
+
+## Profile Settings V1
+
+```typescript
+interface ProfileSettingsV1 {
+  privacy?: PrivacySettings;
+  notification?: NotificationSettings;
+}
+```
+
+---
+
+## Database Field
+
+| Field | Type | Description |
+|-------|------|-------------|
+| settings | jsonb | User preferences including privacy and notification settings |
+
+---
+
+## JSON Examples
+
+### Default Settings
+
+```json
+{
+  "privacy": {
+    "show_email": false,
+    "show_online_status": true
+  },
+  "notification": {
+    "friend_request": true,
+    "calendar_invite": true,
+    "calendar_update": true,
+    "calendar_delete": true,
+    "system_message": true
+  }
+}
+```
+
+### Minimal Settings
+
+```json
+{
+  "notification": {
+    "friend_request": false
+  }
+}
+```