fix: Update URL Value method to use pointer receiver for consistency

gemini/gemini_url.go

@@ -39,7 +39,7 @@ func (u *URL) String() string {
 }
 
 // Value implements the driver.Valuer interface
-func (u URL) Value() (driver.Value, error) {
+func (u *URL) Value() (driver.Value, error) {
 	if u.Full == "" {
 		return nil, nil
 	}