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/postgres/channel_store.go

@@ -113,7 +113,7 @@ func NewChannelStore(db sqlcgen.DBTX, opts ...ChannelStoreOption) *ChannelStore
 	return s
 }
 
-const channelColumns = `c.id, c.access_hash, c.creator_user_id, c.title, c.about, COALESCE(c.username, ''), c.verified,
+const channelColumns = `c.id, c.access_hash, c.creator_user_id, c.title, c.about, COALESCE(c.username, ''), c.verified, c.scam, c.fake, c.gigagroup,
 c.broadcast, c.megagroup, c.forum, c.forum_tabs, c.autotranslation, c.restricted_sponsored, c.broadcast_messages_allowed, c.send_paid_messages_stars, c.noforwards, c.join_to_send, c.join_request, c.signatures, c.pre_history_hidden, c.participants_hidden, c.antispam,
 EXISTS (SELECT 1 FROM channel_invites ci WHERE ci.channel_id = c.id AND NOT ci.revoked) AS has_link,
 c.linked_chat_id, c.linked_community_id, c.monoforum, c.linked_monoforum_id, c.slowmode_seconds, c.boosts_unrestrict, c.default_banned_rights::text,