MVP-0: First Field Upload — UI with Dataset Explorer, Artifact Viewer, Mission Upload

- Dataset Explorer: list missions with processing status
- Artifact Viewer: mission details, metadata, processing status
- Mission Upload: simple video upload form
- React + Vite + React Router
- Proxy to API at localhost:3000

MVP-0 Acceptance Criteria:
✅ Upload video
✅ Create mission
✅ View mission in Dataset Explorer
✅ View artifact details
✅ See processing status

No AI. Just file transfer, storage, metadata, registry.

Next: Pilot 001 — First real field upload

packages/ui/vite.config.ts

@@ -0,0 +1,12 @@
+import { defineConfig } from 'vite';
+import react from '@vitejs/plugin-react';
+
+export default defineConfig({
+  plugins: [react()],
+  server: {
+    port: 3001,
+    proxy: {
+      '/api': 'http://localhost:3000'
+    }
+  }
+});