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/src/routes/index.ts

@@ -0,0 +1,15 @@
+import { FastifyInstance } from "fastify";
+
+export function darkwatchRoutes(fastify: FastifyInstance) {
+  fastify.register(async (root) => {
+    const watchlist = (await import("./watchlist.routes")).watchlistRoutes;
+    const exposures = (await import("./exposure.routes")).exposureRoutes;
+    const alerts = (await import("./alert.routes")).alertRoutes;
+    const scans = (await import("./scan.routes")).scanRoutes;
+
+    root.register(watchlist, { prefix: "/watchlist" });
+    root.register(exposures, { prefix: "/exposures" });
+    root.register(alerts, { prefix: "/alerts" });
+    root.register(scans, { prefix: "/scan" });
+  }, { prefix: "/api/v1/darkwatch" });
+}