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).

deploy/migrations/0136_scam_fake_flags.down.sql

@@ -0,0 +1,7 @@
+ALTER TABLE public.channels
+	DROP COLUMN IF EXISTS scam,
+	DROP COLUMN IF EXISTS fake;
+
+ALTER TABLE public.users
+	DROP COLUMN IF EXISTS scam,
+	DROP COLUMN IF EXISTS fake;

deploy/migrations/0136_scam_fake_flags.up.sql

@@ -0,0 +1,9 @@
+-- SCAM / FAKE moderation flags for users (incl. bots) and channels.
+-- Mirrors the Layer 228 user.scam/user.fake and channel.scam/channel.fake TL flags.
+ALTER TABLE public.users
+	ADD COLUMN IF NOT EXISTS scam boolean DEFAULT false NOT NULL,
+	ADD COLUMN IF NOT EXISTS fake boolean DEFAULT false NOT NULL;
+
+ALTER TABLE public.channels
+	ADD COLUMN IF NOT EXISTS scam boolean DEFAULT false NOT NULL,
+	ADD COLUMN IF NOT EXISTS fake boolean DEFAULT false NOT NULL;

deploy/migrations/0137_channel_gigagroup.down.sql

@@ -0,0 +1,2 @@
+ALTER TABLE public.channels
+	DROP COLUMN IF EXISTS gigagroup;

deploy/migrations/0137_channel_gigagroup.up.sql

@@ -0,0 +1,3 @@
+-- gigagroup flag for supergroups (Layer 228 channel.gigagroup).
+ALTER TABLE public.channels
+	ADD COLUMN IF NOT EXISTS gigagroup boolean DEFAULT false NOT NULL;