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/dto/admin_dto.go

@@ -37,3 +37,13 @@ type UpdateProfileQuestionRequest struct {
 type RejectUserRequest struct {
 	Reason string `json:"reason" binding:"required,min=3,max=500"`
 }
+
+// BlockUserRequest بلاک کردن یک کاربر توسط ادمین (دلیل الزامی است)
+type BlockUserRequest struct {
+	Reason string `json:"reason" binding:"required,min=3,max=500"`
+}
+
+// ReportUserRequest ثبت یک یادداشت نظارتی روی یک کاربر (دلیل الزامی است)
+type ReportUserRequest struct {
+	Reason string `json:"reason" binding:"required,min=3,max=500"`
+}