feat: add local auth billing and usage management

app/api/admin/billing/prices/route.ts

@@ -0,0 +1,16 @@
+import { jsonError, jsonOk } from "@/lib/server/api";
+import { requireSuperAdminSession } from "@/lib/server/auth/current-user";
+import { listBillingPriceRules } from "@/lib/server/billing-store";
+import { ensureDefaultBillingPriceRules } from "@/lib/server/billing-catalog";
+
+export const runtime = "nodejs";
+
+export async function GET() {
+  try {
+    await requireSuperAdminSession();
+    await ensureDefaultBillingPriceRules();
+    return jsonOk({ priceRules: await listBillingPriceRules({ includeDisabled: true }) });
+  } catch (error) {
+    return jsonError(error, 500, { source: "api.admin.billing.prices" });
+  }
+}