Add admin user moderation: block/unblock, reports, matches list, photo review

- User blocking (with reason) now closes the auth gap immediately — a
  blocked user's still-valid access token stops working on the next
  request, not just on their next OTP/refresh.
- Admin-created reports (moderation notes) per user, viewable in a history
  list independent of block status.
- GET /admin/users: full paginated, searchable user list with report counts.
- GET /admin/matches: all matches across the app ("friends" who mutually
  liked each other), for admin visibility.
- GET/DELETE /admin/photos: paginated feed of every uploaded photo with
  uploader info, so admins can review and remove content without going
  user-by-user.
- Per-user activity: monitoring requests can now be filtered by user_id, so
  a user's detail page can show their recent API activity.
- Batched the profile-selections query in fullProfilePayload (was 6 queries
  per view, now 1) for consistency with the earlier N+1 fixes.

internal/repository/report_repository.go

@@ -0,0 +1,53 @@
+package repository
+
+import (
+	"gorm.io/gorm"
+
+	"dating-app/internal/models"
+)
+
+type ReportRepository struct {
+	db *gorm.DB
+}
+
+func NewReportRepository(db *gorm.DB) *ReportRepository {
+	return &ReportRepository{db: db}
+}
+
+func (r *ReportRepository) Create(report *models.Report) error {
+	return r.db.Create(report).Error
+}
+
+func (r *ReportRepository) ListByUser(userID uint) ([]models.Report, error) {
+	var reports []models.Report
+	err := r.db.Where("user_id = ?", userID).Order("created_at desc").Find(&reports).Error
+	return reports, err
+}
+
+// CountsByUserIDs تعداد گزارش‌های ثبت‌شده روی چند کاربر رو با هم، در یک
+// کوئری برمی‌گردونه (برای نشون دادن نشان تعداد گزارش روی لیست کاربران، بدون
+// یک کوئری جدا به‌ازای هر کاربر).
+func (r *ReportRepository) CountsByUserIDs(userIDs []uint) (map[uint]int64, error) {
+	result := make(map[uint]int64, len(userIDs))
+	if len(userIDs) == 0 {
+		return result, nil
+	}
+
+	type row struct {
+		UserID uint
+		Count  int64
+	}
+	var rows []row
+	err := r.db.Model(&models.Report{}).
+		Select("user_id, count(*) as count").
+		Where("user_id IN ?", userIDs).
+		Group("user_id").
+		Find(&rows).Error
+	if err != nil {
+		return nil, err
+	}
+	for _, rr := range rows {
+		result[rr.UserID] = rr.Count
+	}
+	return result, nil
+}