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/tests/unit/v1/friendships/test_friendship_repository.py

@@ -84,7 +84,7 @@ class TestFriendshipRepository:
         assert inbox is not None
         assert friendship.initiator_id == initiator_id
         assert inbox.recipient_id == recipient_id
-        assert inbox.content == content
+        assert inbox.content == {"type": "request", "message": content}
 
     @pytest.mark.asyncio
     async def test_get_friendship_between_users_returns_friendship(

backend/tests/unit/v1/schedule_items/test_share.py

@@ -192,7 +192,7 @@ async def test_share_success_creates_calendar_invitation_message() -> None:
     assert message.sender_id == owner_id
     assert message.schedule_item_id == item_id
     assert message.message_type == InboxMessageType.CALENDAR
-    assert message.content == '{"type": "invite", "permission": 5, "action": "pending"}'
+    assert message.content == {"type": "invite", "permission": 5, "action": "pending"}
     session.commit.assert_awaited_once()
 
 

backend/tests/unit/v1/schedule_items/test_subscription.py

@@ -95,7 +95,7 @@ async def test_accept_subscription_success(
     inbox_message = MagicMock(spec=InboxMessage)
     inbox_message.id = uuid4()
     inbox_message.sender_id = sender_id
-    inbox_message.content = json.dumps({"type": "invite", "permission": 1})
+    inbox_message.content = {"type": "invite", "permission": 1}
     inbox_message.status = InboxMessageStatus.PENDING
 
     service = ScheduleItemService(