fix: allow clearing user remark in basic info update

Co-authored-by: multica-agent <github@multica.ai>

internal/types/types.go

@@ -3236,7 +3236,7 @@ type UpdateUserBasiceInfoRequest struct {
 	RefererId          *int64  `json:"referer_id"`
 	Enable             *bool   `json:"enable"`
 	IsAdmin            *bool   `json:"is_admin"`
-	Remark             string  `json:"remark"`
+	Remark             *string `json:"remark"`
 }
 
 type UpdateUserNotifyRequest struct {

internal/types/types_test.go

@@ -0,0 +1,33 @@
+package types
+
+import (
+	"encoding/json"
+	"testing"
+)
+
+func TestUpdateUserBasiceInfoRequestDistinguishesOmittedAndEmptyRemark(t *testing.T) {
+	var omitted UpdateUserBasiceInfoRequest
+	if err := json.Unmarshal([]byte(`{"user_id":1001}`), &omitted); err != nil {
+		t.Fatalf("unmarshal omitted remark: %v", err)
+	}
+	if omitted.Remark != nil {
+		t.Fatalf("omitted remark should stay nil, got %q", *omitted.Remark)
+	}
+	if omitted.RefererId != nil {
+		t.Fatalf("omitted referer_id should stay nil, got %d", *omitted.RefererId)
+	}
+	if omitted.Balance != nil || omitted.GiftAmount != nil || omitted.Commission != nil {
+		t.Fatalf("omitted money fields should stay nil, got balance=%v gift=%v commission=%v", omitted.Balance, omitted.GiftAmount, omitted.Commission)
+	}
+
+	var cleared UpdateUserBasiceInfoRequest
+	if err := json.Unmarshal([]byte(`{"user_id":1001,"remark":""}`), &cleared); err != nil {
+		t.Fatalf("unmarshal empty remark: %v", err)
+	}
+	if cleared.Remark == nil {
+		t.Fatal("explicit empty remark should be present")
+	}
+	if *cleared.Remark != "" {
+		t.Fatalf("explicit empty remark should decode to empty string, got %q", *cleared.Remark)
+	}
+}