fix: close release preflight gaps

Route public health checks to the API, backfill and synchronize job opportunities, stabilize SPA smoke tests, and document operator-only production steps.

job-tracker-ui/next.config.js

@@ -2,9 +2,14 @@
 const nextConfig = {
   // The whole app is client-rendered React Router behind auth (see app/page.tsx) -- static
   // export keeps the same "one index.html + JS bundle, served by nginx" deploy as CRA had.
-  // `next dev` cannot generate arbitrary optional-catch-all paths under static-export mode.
+  // Development mirrors nginx's SPA fallback with a rewrite to the root shell.
   output: process.env.NODE_ENV === "development" ? undefined : "export",
   reactStrictMode: true,
+  ...(process.env.NODE_ENV === "development" && {
+    async rewrites() {
+      return [{ source: "/:path*", destination: "/" }];
+    },
+  }),
 };
 
 module.exports = nextConfig;