admin: gift granting, collectible attribute/number control, and Layer 228 moderation tools

Admin console additions (Layer 228):
- Give Gifts: dedicated tab with sorted Lottie/TGS gift picker + inline form; grant any catalog gift to a user/channel from 777000 (no charge)
- Upgraded/collectible delivery: mint a unique gift with admin-selected model/pattern/backdrop and custom number, or random/auto (DB FK + UNIQUE(gift_id,num) enforce invariants)
- SCAM/FAKE flags for users/channels (migration 0136) with configurable profile warning (TELESRV_SCAM_WARNING/TELESRV_FAKE_WARNING)
- Support toggle, force channel settings incl. gigagroup (migration 0137), username management, cosmetic color/emoji-status
- Emoji admin tab (custom emoji list + document IDs + Lottie/TGS preview)
- Bot management; soft UI / dark theme
Wired through Router -> admin.Service -> adminapi -> BFF -> React panel (en/zh/ru).

internal/rpc/users.go

@@ -247,6 +247,11 @@ func (r *Router) buildUserFullProjection(ctx context.Context, currentUserID int6
 			about = ""
 		}
 	}
+	// Surface the scam/fake warning to other viewers (never to the account
+	// itself), non-destructively over the projected About.
+	if u.ID != currentUserID {
+		about = aboutWithModerationWarning(about, defaultScamWarningUser, defaultFakeWarningUser, u.Scam, u.Fake)
+	}
 	full := tg.UserFull{
 		ID:             u.ID,
 		About:          about,