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/device_repository_test.go

@@ -13,6 +13,7 @@ import (
 	"gorm.io/gorm/logger"
 
 	"github.com/user-management-system/internal/domain"
+	"github.com/user-management-system/internal/pagination"
 )
 
 var deviceTestCounter int64
@@ -484,3 +485,91 @@ func createDevice(t *testing.T, repo *DeviceRepository, ctx context.Context, use
 	}
 	return d, nil
 }
+
+// TestDeviceRepository_ListAllCursor 测试设备游标分页查询
+func TestDeviceRepository_ListAllCursor(t *testing.T) {
+	db := setupDeviceTestDB(t)
+	repo := NewDeviceRepository(db)
+	ctx := context.Background()
+
+	// 创建设备（需要设置LastActiveTime以支持游标分页）
+	now := time.Now()
+	for i := 0; i < 5; i++ {
+		repo.Create(ctx, &domain.Device{
+			UserID:          int64(i + 1),
+			DeviceID:        "cursor-device-" + string(rune('a'+i)),
+			DeviceName:      "设备" + string(rune('0'+i)),
+			Status:          domain.DeviceStatusActive,
+			LastActiveTime:  now.Add(-time.Duration(i) * time.Minute),
+		})
+	}
+
+	// 第一次查询，获取前3个
+	devices, hasMore, err := repo.ListAllCursor(ctx, &ListDevicesParams{Offset: 0, Limit: 10}, 3, nil)
+	if err != nil {
+		t.Fatalf("ListAllCursor() error = %v", err)
+	}
+	if len(devices) != 3 {
+		t.Errorf("len(devices) = %d, want 3", len(devices))
+	}
+	if !hasMore {
+		t.Error("hasMore should be true when more devices exist")
+	}
+
+	// 使用游标继续查询
+	lastDevice := devices[len(devices)-1]
+	cursor := &pagination.Cursor{
+		LastID:    lastDevice.ID,
+		LastValue: lastDevice.LastActiveTime,
+	}
+	devices2, hasMore2, err := repo.ListAllCursor(ctx, &ListDevicesParams{Offset: 0, Limit: 10}, 3, cursor)
+	if err != nil {
+		t.Fatalf("ListAllCursor() error = %v", err)
+	}
+	if len(devices2) != 2 {
+		t.Errorf("len(devices2) = %d, want 2", len(devices2))
+	}
+	if hasMore2 {
+		t.Error("hasMore2 should be false")
+	}
+}
+
+// TestDeviceRepository_ListAllCursor_WithFilters 测试带筛选条件的设备游标分页
+func TestDeviceRepository_ListAllCursor_WithFilters(t *testing.T) {
+	db := setupDeviceTestDB(t)
+	repo := NewDeviceRepository(db)
+	ctx := context.Background()
+
+	now := time.Now()
+	repo.Create(ctx, &domain.Device{
+		UserID:          1,
+		DeviceID:        "filter-dev1",
+		DeviceName:      "用户1设备",
+		Status:          domain.DeviceStatusActive,
+		LastActiveTime:  now,
+	})
+	repo.Create(ctx, &domain.Device{
+		UserID:          2,
+		DeviceID:        "filter-dev2",
+		DeviceName:      "用户2设备",
+		Status:          domain.DeviceStatusActive,
+		LastActiveTime:  now,
+	})
+	repo.Create(ctx, &domain.Device{
+		UserID:          1,
+		DeviceID:        "filter-dev3",
+		DeviceName:      "用户1禁用设备",
+		Status:          domain.DeviceStatusInactive,
+		LastActiveTime:  now,
+	})
+
+	// 按用户ID筛选
+	status := domain.DeviceStatusActive
+	devices, _, err := repo.ListAllCursor(ctx, &ListDevicesParams{UserID: 1, Status: &status, Offset: 0, Limit: 10}, 10, nil)
+	if err != nil {
+		t.Fatalf("ListAllCursor() error = %v", err)
+	}
+	if len(devices) != 1 {
+		t.Errorf("len(devices) = %d, want 1", len(devices))
+	}
+}