fix: sync parent app-of-apps before syncing customer app on upgrade

ArgoCD needs the customers app-of-apps to refresh first so it picks up
the new targetRevision from the charts repo before syncing the child app.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/routes/customers.ts

@@ -342,6 +342,7 @@ export async function customerRoutes(app: FastifyInstance) {
     if (!customer) return reply.code(404).send({ message: "Not found" });
     const version = await getLatestChartVersion();
     await upgradeCustomerChart(slug, version);
+    await syncArgoApp("customers");
     await syncArgoApp(`customer-${slug}`);
     await db`UPDATE customers SET updated_at = NOW() WHERE slug = ${slug}`;
     app.log.info({ slug, version }, "customer chart upgraded");
@@ -354,6 +355,7 @@ export async function customerRoutes(app: FastifyInstance) {
     const version = await getLatestChartVersion();
     const slugs = customers.map((c: any) => c.slug);
     await upgradeAllCustomerCharts(slugs, version);
+    await syncArgoApp("customers");
     await Promise.all(slugs.map((s: string) => syncArgoApp(`customer-${s}`)));
     app.log.info({ slugs, version }, "all customers chart upgraded");
     return reply.send({ upgraded: slugs, version });