feat: Agent Office — AI 에이전트 가상 오피스 (#2)

## Summary
- Canvas 2D 픽셀아트 오피스 렌더링 (SpriteSheet + TileMap + AgentSprite)
- WebSocket 실시간 에이전트 상태 동기화 (useAgentManager)
- ChatPanel (명령/승인) + TaskHistory (작업 이력) UI
- 다크 테마 + glassmorphism 패널

## Changes (7 commits)
- API helpers + route + Lab entry
- Canvas engine: SpriteSheet, TileMap, AgentSprite, OfficeRenderer
- React hooks: useAgentManager, useOfficeCanvas
- Components: ChatPanel, TaskHistory
- Main page + CSS
- Code review fixes: claude agent 참조 제거, rejected 배지 추가

Reviewed-on: #2

src/routes.jsx

@@ -117,6 +117,15 @@ export const navLinks = [
         icon: <IconTodo />,
         accent: '#f472b6',
     },
+    {
+        id: 'agent-office',
+        label: 'Agent Office',
+        path: '/agent-office',
+        subtitle: 'AI LAB',
+        description: 'AI 에이전트 사무실',
+        icon: <span style={{fontSize:'1.2em'}}>🏢</span>,
+        accent: '#8b5cf6',
+    },
 ];
 
 export const appRoutes = [
@@ -172,4 +181,8 @@ export const appRoutes = [
         path: 'todo',
         element: <Todo />,
     },
+    {
+        path: 'agent-office',
+        lazy: () => import('./pages/agent-office/AgentOffice'),
+    },
 ];