Session fixes: auth working, frontend files created, running locally

- Fixed circular imports in API files
- Created missing frontend lib files (api.ts, socket.ts, types.ts)
- Fixed register endpoint to return token instead of user
- Updated Anthropic client version
- Backend running locally on port 8000
- Frontend running on port 3000
- Authentication working
- Still need: channel response fix, WebSocket auth fix

backend/api/files.py

@@ -20,7 +20,7 @@ from api.auth import get_current_user
 router = APIRouter()
 
 # File storage configuration
-UPLOAD_DIR = os.getenv("UPLOAD_DIR", "./uploads")
+UPLOAD_DIR = os.getenv("UPLOAD_DIR", "/tmp/uploads")
 Path(UPLOAD_DIR).mkdir(parents=True, exist_ok=True)
 
 class FileResponse(BaseModel):