FRE-4471: Scaffold DarkWatch MVP — monorepo, schema, services, API routes, tests

- Turborepo monorepo structure (packages: api, db, types, jobs; services: darkwatch)
- Prisma schema: User, WatchListItem, Exposure, Alert, ScanJob models
- WatchListService: CRUD with normalization, dedup, tier-based limits
- HIBPService: API integration with severity scoring
- MatchingEngine: exact-match with content hash dedup
- AlertPipeline: dedup window, email notifications
- ScanService: orchestrates watch list -> HIBP -> match -> alert flow
- BullMQ job workers for scan and alert processing
- Fastify API routes: watchlist, exposures, alerts, scan
- Docker Compose: PostgreSQL 16 + Redis 7
- 15 unit tests passing
- Implementation plan document uploaded

packages/api/package.json

@@ -0,0 +1,21 @@
+{
+  "name": "@shieldai/api",
+  "version": "0.1.0",
+  "scripts": {
+    "dev": "tsx watch src/server.ts",
+    "build": "tsc",
+    "start": "node dist/server.js",
+    "test": "vitest run",
+    "lint": "eslint src/"
+  },
+  "dependencies": {
+    "@fastify/cors": "^10.0.1",
+    "@fastify/helmet": "^13.0.1",
+    "@fastify/rate-limit": "^9.0.0",
+    "@fastify/sensible": "^6.0.1",
+    "@shieldai/db": "0.1.0",
+    "@shieldai/types": "0.1.0",
+    "fastify": "^5.2.0",
+    "@shieldai/darkwatch": "0.1.0"
+  }
+}