Add claude code support

internal/auth/empty/token.go

@@ -0,0 +1,12 @@
+package empty
+
+type EmptyStorage struct {
+	// Type indicates the type (gemini, chatgpt, claude) of token storage.
+	Type string `json:"type"`
+}
+
+// SaveTokenToFile serializes the token storage to a JSON file.
+func (ts *EmptyStorage) SaveTokenToFile(authFilePath string) error {
+	ts.Type = "empty"
+	return nil
+}