feat: add local auth billing and usage management

app/api/billing/route.ts

@@ -0,0 +1,24 @@
+import { jsonError, jsonOk } from "@/lib/server/api";
+import { requireAppSession } from "@/lib/server/auth/current-user";
+import { getBillingOverview } from "@/lib/server/billing-service";
+
+export const runtime = "nodejs";
+export const dynamic = "force-dynamic";
+
+export async function GET() {
+  try {
+    const session = await requireAppSession();
+    const organizationId = session.user.organizationId;
+    if (!organizationId) throw Object.assign(new Error("当前账号未绑定组织。"), { status: 422 });
+    const overview = await getBillingOverview({ organizationId, accountId: session.user.id });
+    return jsonOk({
+      organization: {
+        id: organizationId,
+        name: session.user.organizationName || organizationId
+      },
+      ...overview
+    });
+  } catch (error) {
+    return jsonError(error, 500, { source: "api.billing" });
+  }
+}