fix: post-2.0 audit bug fixes (404 route, worker logging, outpaint gate, pandoc path)

Surgical post-2.0 fixes: SPA 404 route, worker logging, outpaint gate, pandoc path resolution.

apps/api/src/jobs/worker.ts

@@ -824,7 +824,7 @@ export function startWorkers(): void {
     });
 
     worker.on("error", (err) => {
-      console.error(`Worker error [${pool}]:`, err);
+      logger.error({ err, pool }, "Worker error");
     });
 
     workers.push(worker);