Fix TypeScript error: cast unknown to string in deployment loop

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/api/deployments/route.ts

@@ -90,8 +90,10 @@ echo json_encode($result->toArray());
 
   // First pass: find latest finished deployment per app
   for (const d of rawDeployments) {
-    if (d.status === 'finished' && !latestByApp.has(d.application_uuid)) {
-      latestByApp.set(d.application_uuid, d.deployment_uuid);
+    const appUuid = d.application_uuid as string;
+    const deployUuid = d.deployment_uuid as string;
+    if (d.status === 'finished' && !latestByApp.has(appUuid)) {
+      latestByApp.set(appUuid, deployUuid);
     }
   }