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

package.json

@@ -0,0 +1,26 @@
+{
+  "name": "shieldai",
+  "version": "0.1.0",
+  "private": true,
+  "workspaces": [
+    "packages/*",
+    "services/*"
+  ],
+  "scripts": {
+    "dev": "turbo run dev",
+    "build": "turbo run build",
+    "test": "turbo run test",
+    "db:migrate": "turbo run db:migrate",
+    "db:seed": "turbo run db:seed",
+    "lint": "turbo run lint"
+  },
+  "devDependencies": {
+    "@types/node": "^25.6.0",
+    "turbo": "^2.3.0",
+    "typescript": "^5.7.0",
+    "vitest": "^4.1.5"
+  },
+  "engines": {
+    "node": ">=20.0.0"
+  }
+}