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).

docs/configuration.en.md

@@ -63,6 +63,8 @@ This document describes every setting loaded by `internal/config`. Defaults and
 | `TELESRV_PUBLIC_APP_LINK_BASE` | nullable custom URL base / empty | Optional host-based root for multi-server clients, for example `owpg://example.com`. When set, links use `owpg://example.com/oauth`, `owpg://example.com/<username>`, and equivalent route paths. Only exact `<custom-scheme>://<host>` values are accepted; ports, paths, queries, and fragments are rejected. `TELESRV_PUBLIC_APP_SCHEME` remains an accepted legacy input. |
 | `TELESRV_PUBLIC_WEB_BASE_URL` | HTTP(S) URL / `https://web.telesrv.net` | Web-client root used by public username pages. Same URL validation as `TELESRV_PUBLIC_BASE_URL`. |
 | `TELESRV_PUBLIC_APP_NAME` | string / `telesrv` | Public landing-page product name; trimmed, non-empty, no control characters, maximum 64 Unicode characters. |
+| `TELESRV_SCAM_WARNING` | string / empty | Overrides the profile warning injected into `getFullUser`/`getFullChannel` About for SCAM-flagged peers. Empty keeps the built-in per-peer-type English default. Non-destructive: the stored bio/description is never overwritten and the warning is re-applied from the flag on every read. Clients cannot localize server-provided text. |
+| `TELESRV_FAKE_WARNING` | string / empty | Same as `TELESRV_SCAM_WARNING`, for FAKE-flagged peers. |
 | `TELESRV_PUBLIC_LINK_WEB_ADDR` | nullable address / empty | Read-only username/avatar/sticker/emoji/chatlist/collectible-gift landing-page listener. Empty disables it. Production should bind loopback behind exact nginx routes. `.env.example` enables `127.0.0.1:2401` for development. |
 | `TELESRV_TELEGRAM_LOGIN_ENABLE` | bool / `false` | Mount the self-hosted Telegram Login/OIDC provider on `TELESRV_PUBLIC_LINK_WEB_ADDR`. Enabling it requires that listener and all key files below. |
 | `TELESRV_TELEGRAM_LOGIN_ISSUER` | absolute origin URL / `TELESRV_PUBLIC_BASE_URL` | Exact public issuer used in discovery and tokens. HTTPS is required by default; paths, credentials, query, and fragment are rejected. The next setting permits any HTTP host/IP. |