Rename customs-tablet-frontend to public-frontend and add new features

- Rename customs-tablet-frontend/ to public-frontend/ for broader scope
- Add new pages: customs, inspection with camera integration
- Add new services: apiClient.ts, backendApi.ts, normalizers.ts
- Add CameraFrame component for real-time video streaming
- Add scan_fixer module with clock_publisher and timestamp fix utilities
- Update startup scripts to support new frontend structure
- Update arm_server configuration and service files

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

public-frontend/next.config.mjs

@@ -0,0 +1,19 @@
+/** @type {import('next').NextConfig} */
+const backendUrl = process.env.BACKEND_URL || process.env.NEXT_PUBLIC_BACKEND_URL || 'http://127.0.0.1:5000';
+
+const nextConfig = {
+  async rewrites() {
+    return [
+      {
+        source: '/api/:path*',
+        destination: `${backendUrl}/api/:path*`,
+      },
+      {
+        source: '/photos/:path*',
+        destination: `${backendUrl}/photos/:path*`,
+      },
+    ];
+  },
+};
+
+export default nextConfig;