test: add repository tests to improve coverage from 46.6% to 74%

New test files:
- custom_field_repository_test.go: 10 tests for CustomFieldRepository & UserCustomFieldValueRepository
- login_log_repository_test.go: 3 tests for ListCursor, ListByUserIDCursor, ListAllForExport
- operation_log_repository_test.go: 1 test for ListCursor
- role_repository_test.go: 2 tests for GetAncestorIDs, GetAncestors
- social_account_repository_test.go: 8 CRUD tests
- theme_repository_test.go: 10 tests for ThemeConfigRepository
- user_role_repository_test.go: 1 test for DeleteByUserAndRole

Modified test files:
- device_repository_test.go: Added ListAllCursor tests
- user_repository_test.go: Added AdvancedSearch tests
- webhook_repository_test.go: Added ListByCreatorPaginated test

Updated documentation with new coverage status.

internal/repository/webhook_repository_test.go

@@ -188,3 +188,40 @@ func TestWebhookRepositoryCreateAndListDeliveries(t *testing.T) {
 		t.Fatal("expected deliveries to be returned in reverse created_at order")
 	}
 }
+
+func TestWebhookRepositoryListByCreatorPaginated(t *testing.T) {
+	repo := setupWebhookRepository(t)
+	ctx := context.Background()
+
+	// 创建多个webhook
+	for i := 0; i < 5; i++ {
+		if err := repo.Create(ctx, newWebhookFixture("wh-creator1-"+string(rune('a'+i)), 1, domain.WebhookStatusActive)); err != nil {
+			t.Fatalf("Create failed: %v", err)
+		}
+	}
+	// 另一个用户的webhook
+	if err := repo.Create(ctx, newWebhookFixture("wh-creator2", 2, domain.WebhookStatusActive)); err != nil {
+		t.Fatalf("Create failed: %v", err)
+	}
+
+	// 测试分页查询创建者1的webhook
+	webhooks, total, err := repo.ListByCreatorPaginated(ctx, 1, 0, 3)
+	if err != nil {
+		t.Fatalf("ListByCreatorPaginated failed: %v", err)
+	}
+	if len(webhooks) != 3 {
+		t.Errorf("len(webhooks) = %d, want 3", len(webhooks))
+	}
+	if total != 5 {
+		t.Errorf("total = %d, want 5", total)
+	}
+
+	// 测试第二页
+	webhooks2, _, err := repo.ListByCreatorPaginated(ctx, 1, 3, 3)
+	if err != nil {
+		t.Fatalf("ListByCreatorPaginated page 2 failed: %v", err)
+	}
+	if len(webhooks2) != 2 {
+		t.Errorf("len(webhooks2) = %d, want 2", len(webhooks2))
+	}
+}