feat(admin): add image quota management UI on memind_adm 5174

Add image-quota admin pages and API wiring for plan defaults, ledger, and per-user
grants, plus local verify scripts and AGENTS.md note that this repo is the sole
admin UI surface.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/types.ts

@@ -681,6 +681,32 @@ export type AdminSubscription = {
   periodTokensUsed: number;
   periodImagesLimit: number;
   periodImagesUsed: number;
+  periodImagesBonus?: number;
+  note: string | null;
+  createdAt: number;
+};
+
+export type ImageQuotaView = {
+  limit: number;
+  bonus: number;
+  used: number;
+  total: number | null;
+  remaining: number | null;
+  unlimited: boolean;
+  periodEnd: number | null;
+  planType: string | null;
+};
+
+export type ImageQuotaLedgerEntry = {
+  id: string;
+  userId: string;
+  username?: string;
+  displayName?: string;
+  delta: number;
+  balanceAfter: number | null;
+  reason: string;
+  refId: string | null;
+  operatorId: string | null;
   note: string | null;
   createdAt: number;
 };