feat: key provider

internal/errors/errors.go

@@ -33,6 +33,7 @@ var (
 	ErrForbidden           = &APIError{HTTPStatus: http.StatusForbidden, Code: "FORBIDDEN", Message: "You do not have permission to access this resource"}
 	ErrTaskInProgress      = &APIError{HTTPStatus: http.StatusConflict, Code: "TASK_IN_PROGRESS", Message: "A task is already in progress"}
 	ErrBadGateway          = &APIError{HTTPStatus: http.StatusBadGateway, Code: "BAD_GATEWAY", Message: "Upstream service error"}
+	ErrNoActiveKeys        = &APIError{HTTPStatus: http.StatusServiceUnavailable, Code: "NO_ACTIVE_KEYS", Message: "No active API keys available for this group"}
 )
 
 // NewAPIError creates a new APIError with a custom message.