fix: resolve GitHub Actions CI failures (lint, typecheck, test, format)

- Remove unused `Locale` type imports from admin pages
- Fix type annotations in easy-pay client test (CID fields as string | undefined)
- Replace `as any` with proper types in limits test
- Fix listSubscriptions test mock response structure (data.data.items)
- Fix formatting with Prettier

src/app/admin/dashboard/page.tsx

@@ -7,7 +7,7 @@ import DashboardStats from '@/components/admin/DashboardStats';
 import DailyChart from '@/components/admin/DailyChart';
 import Leaderboard from '@/components/admin/Leaderboard';
 import PaymentMethodChart from '@/components/admin/PaymentMethodChart';
-import { resolveLocale, type Locale } from '@/lib/locale';
+import { resolveLocale } from '@/lib/locale';
 
 interface DashboardData {
   summary: {

src/app/admin/orders/page.tsx

@@ -6,7 +6,7 @@ import OrderTable from '@/components/admin/OrderTable';
 import OrderDetail from '@/components/admin/OrderDetail';
 import PaginationBar from '@/components/PaginationBar';
 import PayPageLayout from '@/components/PayPageLayout';
-import { resolveLocale, type Locale } from '@/lib/locale';
+import { resolveLocale } from '@/lib/locale';
 
 interface AdminOrder {
   id: string;

src/app/admin/page.tsx

@@ -7,7 +7,7 @@ import DashboardStats from '@/components/admin/DashboardStats';
 import DailyChart from '@/components/admin/DailyChart';
 import Leaderboard from '@/components/admin/Leaderboard';
 import PaymentMethodChart from '@/components/admin/PaymentMethodChart';
-import { resolveLocale, type Locale } from '@/lib/locale';
+import { resolveLocale } from '@/lib/locale';
 
 interface DashboardData {
   summary: {