feat(backend): enhance task and schedule center APIs with expanded endpoints

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

backend/app/routers/__init__.py

@@ -23,3 +23,4 @@ from app.routers.agent_sessions import router as agent_sessions_router
 from app.routers.terminal import router as terminal_router
 from app.routers.tools import router as tools_router
 from app.routers.remote_mount import router as remote_mount_router
+from app.routers.office import router as office_router