feat: initial tools service with document scanner, image & PDF tools

Self-hosted document scanner and media processing tools.
- Rust Axum gateway + worker pool with NATS JetStream
- Next.js 16 frontend with shadcn/ui
- Scanner pipeline: edge detection, warp, binarization, OCR
- Image tools: compress, resize, convert
- PDF tools: merge, split, compress
- CI/CD with Docker multi-stage build

Co-Authored-By: Kilo <kilo@kilo.ai>

frontend/src/app/scan/result/[id]/page.tsx

@@ -0,0 +1,32 @@
+"use client";
+
+import { useParams } from "next/navigation";
+import { useJobStatus } from "@/hooks/use-job-status";
+import { ProgressBar } from "@/components/tools/progress-bar";
+import { ResultPreview } from "@/components/tools/result-preview";
+
+export default function ScanResultPage() {
+  const params = useParams();
+  const id = params.id as string;
+
+  const { progress, stage, message, status, result, error } = useJobStatus(id, {
+    onComplete: () => {},
+    onError: () => {},
+  });
+
+  return (
+    <div className="container mx-auto px-4 py-8 max-w-3xl">
+      {status === "processing" && (
+        <ProgressBar progress={progress} stage={stage} message={message} status={status} />
+      )}
+      {status === "completed" && result && (
+        <ResultPreview result={result} onProcessAnother={() => window.location.href = "/scan"} />
+      )}
+      {status === "failed" && (
+        <div className="p-6 rounded-xl border glass text-center">
+          <p className="text-destructive font-medium">{error || "Processing failed"}</p>
+        </div>
+      )}
+    </div>
+  );
+}