fix: correct inspector package name in Dockerfiles and add .dockerignore (#50)

* chore: remove inspect.sandboxagent.dev in favor of /ui/

* chore: add 404 page

* fix: correct inspector package name in Dockerfiles and add .dockerignore

- Change @anthropic-ai/sdk-inspector to @sandbox-agent/inspector in all Dockerfiles
- Add .dockerignore to exclude target/, node_modules/, etc from Docker context

The wrong package name caused pnpm install --filter to match nothing, so the
inspector frontend was never built, resulting in binaries without the /ui/ endpoint.

* chore: cargo fmt

* chore(release): update version to 0.1.4-rc.7

frontend/packages/website/src/components/Inspector.tsx

@@ -1,7 +1,5 @@
 'use client';
 
-import { ArrowRight } from 'lucide-react';
-
 export function Inspector() {
   return (
     <section className="relative overflow-hidden border-t border-white/5 py-24">
@@ -13,23 +11,13 @@ export function Inspector() {
           Inspect sessions, view event payloads, and troubleshoot without writing code.
         </p>
 
-        <div className="mb-10 overflow-hidden rounded-2xl border border-white/10 shadow-2xl">
+        <div className="overflow-hidden rounded-2xl border border-white/10 shadow-2xl">
           <img
             src="/images/inspector.png"
             alt="Sandbox Agent Inspector"
             className="w-full"
           />
         </div>
-
-        <a
-          href="https://inspect.sandboxagent.dev"
-          target="_blank"
-          rel="noopener noreferrer"
-          className="inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md border border-white/10 bg-white px-5 py-2.5 text-sm font-medium text-black subpixel-antialiased shadow-sm transition-colors hover:bg-zinc-200"
-        >
-          Open Inspector
-          <ArrowRight className="h-4 w-4" />
-        </a>
       </div>
     </section>
   );