Ship production optimization M1-M12.5A: queues, metrics, HTTP observability, and vector search reliability.

Keep similar-ai from tripping the global circuit on a lone URL 502, clamp Qdrant search to 100, and add Server-Timing plus slow-request logging. Studio shared props, Academy S3 exists caching, heat chunking, and Redis/scheduler hygiene stay in this rollout.

app/Support/Http/TimedInertiaSsrGateway.php

@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Support\Http;
+
+use Illuminate\Http\Request;
+use Inertia\Ssr\Gateway;
+use Inertia\Ssr\HttpGateway;
+use Inertia\Ssr\Response;
+
+/**
+ * Times the existing Inertia SSR HTTP round-trip. Does not change SSR behavior.
+ */
+final class TimedInertiaSsrGateway implements Gateway
+{
+    public function __construct(private readonly HttpGateway $inner)
+    {
+    }
+
+    public function dispatch(array $page): ?Response
+    {
+        $started = hrtime(true);
+        $response = $this->inner->dispatch($page);
+        $durationMs = (hrtime(true) - $started) / 1_000_000;
+
+        $request = request();
+        if ($request instanceof Request) {
+            $request->attributes->set('http.ssr_ms', round($durationMs, 1));
+        }
+
+        return $response;
+    }
+}