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/db/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "@shieldai/db",
+  "version": "0.1.0",
+  "main": "./dist/index.js",
+  "types": "./dist/index.js",
+  "scripts": {
+    "build": "prisma generate && tsc",
+    "db:migrate": "prisma migrate dev",
+    "db:seed": "tsx prisma/seed.ts",
+    "db:studio": "prisma studio",
+    "generate": "prisma generate"
+  },
+  "dependencies": {
+    "@prisma/client": "^6.2.0",
+    "prisma": "^6.2.0"
+  },
+  "devDependencies": {
+    "tsx": "^4.19.0"
+  },
+  "exports": {
+    ".": "./src/index.ts"
+  }
+}