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/tsconfig.json

@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "commonjs",
+    "lib": ["ES2022"],
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true,
+    "resolveJsonModule": true
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist", "**/*.test.ts"]
+}