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/store/user.go

@@ -24,6 +24,10 @@ type UserStore interface {
 	SetPremiumUntil(ctx context.Context, userID int64, until int) (domain.User, error)
 	// SetVerified 设置/取消用户认证标记。认证是用户基础事实，读取投影统一下发。
 	SetVerified(ctx context.Context, userID int64, verified bool) (domain.User, error)
+	// SetScamFake 设置/取消用户的 scam 与 fake 标记（bot 复用同一路径）。
+	SetScamFake(ctx context.Context, userID int64, scam, fake bool) (domain.User, error)
+	// SetSupport 设置/取消用户的 support 标记（官方客服账号）。
+	SetSupport(ctx context.Context, userID int64, support bool) (domain.User, error)
 	// SweepExpiredPremium 把到期（premium_expires_at <= now）的会员行清空并
 	// 返回清理后的用户（供推送 updateUser）；单次最多处理 limit 行。
 	SweepExpiredPremium(ctx context.Context, now int64, limit int) ([]domain.User, error)