PR-004A: Mission Import API — MVP-0 First Field Upload

- POST /api/v1/missions/import — multipart upload with video
- GET /api/v1/missions/:id — retrieve mission
- GET /api/v1/missions — list active missions
- Express + multer for file handling
- Uses application layer handlers (PR-002.5)
- In-memory repositories (swap for PostgreSQL in PR-003B)

Acceptance Tests (5/5 passing):
✅ Import mission with video
✅ Reject upload without video
✅ Retrieve mission by ID
✅ 404 for non-existent mission
✅ Health check

MVP-0 Definition of Done:
✅ Phone → Upload → Store → Retrieve
✅ No AI required
✅ First real artifact produced

Next: PR-005A — Minimal Mission Import UI

packages/api/README.md

@@ -0,0 +1,67 @@
+# @landvex/api
+
+Mission Import API for LandveX Intelligence Lab.
+
+## MVP-0: First Field Upload
+
+Minimal API for importing missions with video files.
+
+### Endpoints
+
+| Method | Endpoint | Description |
+|--------|----------|-------------|
+| POST | `/api/v1/missions/import` | Import mission with video |
+| GET | `/api/v1/missions/:id` | Get mission by ID |
+| GET | `/api/v1/missions` | List active missions |
+| GET | `/health` | Health check |
+
+### Import Mission
+
+```bash
+curl -X POST http://localhost:3000/api/v1/missions/import \
+  -F "inspector=erik_svensson" \
+  -F "location[lat]=59.3293" \
+  -F "location[lng]=18.0686" \
+  -F "device[model]=iPhone14,2" \
+  -F "device[os]=iOS 17.0" \
+  -F "device[appVersion]=1.0.0" \
+  -F "video=@/path/to/video.mp4"
+```
+
+### Response
+
+```json
+{
+  "missionId": "mission_20260702_000001",
+  "sessionId": "session_20260702_000001",
+  "artifactId": "artifact_000001",
+  "status": "created",
+  "file": {
+    "originalName": "video.mp4",
+    "size": 12345678,
+    "path": "uploads/abc123.mp4"
+  }
+}
+```
+
+## Architecture
+
+```
+Express Router → Application Handlers → Domain → In-Memory Repositories
+```
+
+**No AI. No processing. Just store and track.**
+
+## Dependencies
+
+- `@landvex/application` — use cases
+- `@landvex/infrastructure` — in-memory repositories (swap for PostgreSQL in PR-003B)
+- `@landvex/domain` — domain objects
+
+## Tests
+
+```bash
+npm test
+```
+
+5 tests verifying MVP-0 acceptance criteria.