feat(api/middleware): Enhance keyspace not exist error with request URI

- Improve error message clarity by including the request URI when a keyspace does not exist.
- This provides more context for debugging `KeyspaceNotExistError` cases.

Signed-off-by: tenfyzhong <[email protected]>

Author: tenfyzhong

api/middleware/middleware.go

@@ -229,7 +229,7 @@ func KeyspaceCheckerMiddleware() gin.HandlerFunc {
 
 			meta, err := pdAPIClient.LoadKeyspace(c.Request.Context(), keyspace)
 			if errors.IsKeyspaceNotExistError(err) {
-				c.IndentedJSON(http.StatusBadRequest, errors.ErrAPIInvalidParam)
+				c.IndentedJSON(http.StatusBadRequest, errors.ErrAPIInvalidParam.FastGen("URI:%s", c.Request.URL))
 				c.Abort()
 				return
 			} else if err != nil {