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/convert_flags.go

@@ -0,0 +1,81 @@
+package rpc
+
+import (
+	"strings"
+	"sync/atomic"
+)
+
+// Scam/fake profile warnings surfaced in the full-profile About text.
+//
+// Telegram Desktop only ships the SCAM/FAKE badge strings and renders no
+// warning paragraph, while iOS/Android show a localized warning. To make the
+// warning visible on every client, the server injects it into the projected
+// getFullUser/getFullChannel About field. Injection is non-destructive: the
+// stored bio/description is never overwritten, only the response is decorated,
+// so clearing the flag restores the original text and the warning survives the
+// owner editing their bio/description (it is re-applied from the flag on every
+// read).
+//
+// The text is server-provided (clients cannot localize it). Operators override
+// it via TELESRV_SCAM_WARNING / TELESRV_FAKE_WARNING; when unset the built-in
+// per-peer-type English defaults are used. scam takes precedence over fake.
+const (
+	defaultScamWarningUser    = "\u26A0\uFE0F Warning: Many users reported this account as a scam. Please be careful, especially if it asks you for money."
+	defaultFakeWarningUser    = "\u26A0\uFE0F Warning: Many users reported that this account impersonates a famous person or organization."
+	defaultScamWarningChannel = "\u26A0\uFE0F Warning: Many users reported this channel as a scam. Please be careful, especially if it asks you for money."
+	defaultFakeWarningChannel = "\u26A0\uFE0F Warning: Many users reported that this channel impersonates a famous person or organization."
+	defaultScamWarningGroup   = "\u26A0\uFE0F Warning: Many users reported this group as a scam. Please be careful, especially if it asks you for money."
+	defaultFakeWarningGroup   = "\u26A0\uFE0F Warning: Many users reported that this group impersonates a famous person or organization."
+)
+
+// moderationWarningOverrides holds the operator-configured texts. They are set
+// once at startup (SetModerationWarnings) before any request is served, and
+// read on the hot path; atomic.Pointer keeps that race-free without locking.
+var moderationWarningOverrides atomic.Pointer[moderationWarningConfig]
+
+type moderationWarningConfig struct {
+	scam string
+	fake string
+}
+
+// SetModerationWarnings installs operator overrides for the scam/fake profile
+// warnings. Empty strings keep the built-in per-peer-type defaults. A single
+// override applies to every peer type (user/channel/group).
+func SetModerationWarnings(scam, fake string) {
+	moderationWarningOverrides.Store(&moderationWarningConfig{
+		scam: strings.TrimSpace(scam),
+		fake: strings.TrimSpace(fake),
+	})
+}
+
+func moderationOverride() moderationWarningConfig {
+	if cfg := moderationWarningOverrides.Load(); cfg != nil {
+		return *cfg
+	}
+	return moderationWarningConfig{}
+}
+
+// aboutWithModerationWarning prepends the scam/fake warning to a profile About.
+// It returns about unchanged when neither flag is set. The operator override
+// wins over the per-type default; scam wins over fake when both are set.
+func aboutWithModerationWarning(about, scamDefault, fakeDefault string, scam, fake bool) string {
+	override := moderationOverride()
+	warning := ""
+	switch {
+	case scam:
+		if warning = override.scam; warning == "" {
+			warning = scamDefault
+		}
+	case fake:
+		if warning = override.fake; warning == "" {
+			warning = fakeDefault
+		}
+	}
+	if warning == "" {
+		return about
+	}
+	if about = strings.TrimSpace(about); about == "" {
+		return warning
+	}
+	return warning + "\n\n" + about
+}