Add notification settings, account deletion, photo reporting, and pending-user photos

Addresses user bug reports: settings pages needed real notification
preferences and account deletion, admin needed a way to flag a specific
photo independent of deleting it, and the pending-approval users list
needed to surface applicant photos for review.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

internal/handler/common.go

@@ -45,6 +45,9 @@ func toUserProfile(u *models.User) dto.UserProfile {
 		BlockedAt:       u.BlockedAt,
 		Bio:             u.Bio,
 		StreakCount:     u.StreakCount,
+		NotifyMatches:   u.NotifyMatches,
+		NotifyMessages:  u.NotifyMessages,
+		NotifyLikes:     u.NotifyLikes,
 	}
 	if u.Gender != nil {
 		g := string(*u.Gender)