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/memories.md

@@ -0,0 +1,66 @@
+# Memories Protocol
+
+> **NOTE**: This document is the single source of truth. All implementations must follow this specification.
+
+## Overview
+
+User memories stored in the system with flexible content structure.
+
+## Version
+
+- **Current**: `1.0`
+- **Status**: Active
+
+---
+
+## Memory Content
+
+```typescript
+interface MemoryContent {
+  // Reserved for future use
+  // Currently unused, allowing custom extensions
+  [key: string]: any;
+}
+```
+
+---
+
+## Database Field
+
+| Field | Type | Description |
+|-------|------|-------------|
+| content | jsonb | Memory content with flexible structure |
+
+---
+
+## JSON Examples
+
+### Empty Content
+
+```json
+{}
+```
+
+### Future Usage Example
+
+```json
+{
+  "text": "Remember that user prefers morning meetings",
+  "category": "preference",
+  "importance": "high",
+  "tags": ["meetings", "morning", "preference"]
+}
+```
+
+### Agent Memory Example
+
+```json
+{
+  "summary": "User discussed vacation plans for March",
+  "entities": {
+    "dates": ["2026-03-15", "2026-03-20"],
+    "locations": ["Tokyo", "Osaka"]
+  },
+  "sentiment": "positive"
+}
+```