Add Google Calendar sync: OAuth connect flow, dedicated Бронирования calendar, best-effort event create/update/delete on booking changes

src/app/api/google/status/route.ts

@@ -0,0 +1,12 @@
+export const runtime = "nodejs";
+
+import { NextResponse } from "next/server";
+import { requireSession } from "@/lib/auth/require";
+import { getConnectionStatus } from "@/lib/google/calendar";
+
+export async function GET() {
+  const { session, response } = await requireSession();
+  if (!session) return response;
+
+  return NextResponse.json(await getConnectionStatus());
+}