API authorization validation

All API endpoints must implement proper authorization checks before processing requests, especially when authentication mechanisms like tokens are available. When adding new API routes, verify that appropriate authorization validation is in place to prevent unauthorized access to sensitive functionality.

Example implementation pattern:

async def _rh_stats(self, account: str = "user"):
    # Add authorization check before processing
    if not self._validate_admin_token():
        raise HTTPException(status_code=401, detail="Unauthorized")
    
    if not self._stats_service.is_ready:
        # ... rest of endpoint logic

Reference existing authorization patterns in your codebase (such as CompletionsRouter) to ensure consistency in how authorization is implemented across different endpoints. This prevents security vulnerabilities where sensitive data or operations could be accessed without proper authentication.