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/README.md

@@ -0,0 +1,38 @@
+# @landvex/ui
+
+LandveX Intelligence Lab UI — MVP-0 First Field Upload
+
+## Pages
+
+| Page | Route | Purpose |
+|------|-------|---------|
+| Dataset Explorer | `/` | List all missions with processing status |
+| Mission Upload | `/upload` | Upload video and create mission |
+| Artifact Viewer | `/artifact/:id` | View mission details, metadata, processing status |
+
+## MVP-0 Acceptance Criteria
+
+- [x] Upload video
+- [x] Create mission
+- [x] View mission in Dataset Explorer
+- [x] View artifact details
+- [x] See processing status
+
+## No AI in MVP-0
+
+MVP-0 proves:
+- File transfer
+- Storage
+- Metadata extraction
+- Artifact Registry
+- Dataset Explorer
+- Artifact Viewer
+
+## Development
+
+```bash
+npm install
+npm run dev
+```
+
+API proxy: `http://localhost:3000`