feat: add admin updates page with release history

Shows bot and cabinet releases with version badges,
changelogs, and update detection via __APP_VERSION__.

src/api/adminUpdates.ts

@@ -0,0 +1,32 @@
+import apiClient from './client';
+
+// ============ Types ============
+
+export interface ReleaseItem {
+  tag_name: string;
+  name: string;
+  body: string;
+  published_at: string;
+  prerelease: boolean;
+}
+
+export interface ProjectReleasesInfo {
+  current_version: string;
+  has_updates: boolean;
+  releases: ReleaseItem[];
+  repo_url: string;
+}
+
+export interface ReleasesResponse {
+  bot: ProjectReleasesInfo;
+  cabinet: ProjectReleasesInfo;
+}
+
+// ============ API ============
+
+export const adminUpdatesApi = {
+  getReleases: async (): Promise<ReleasesResponse> => {
+    const response = await apiClient.get('/cabinet/admin/updates/releases');
+    return response.data;
+  },
+};