chore: delete stale apps/api/src/db/seed.ts duplicate (GRO-2129)

The apps/api/src/db/seed.ts file was a stale duplicate of packages/db/src/seed.ts
and did not carry the withSeedAdvisoryLock helper from the GRO-2123 fix.

Cleanup details:
  * Delete apps/api/src/db/seed.ts (1349 lines). The reset CronJob's Dockerfile
    `reset` stage runs `pnpm --filter @groombook/db reset` from packages/db/,
    so this file was never on the runtime path. The deployed tree (./src) is
    also unaffected.
  * Update apps/api/package.json `db:seed` and `db:reset` scripts to delegate
    to `pnpm --filter @groombook/db {seed,reset}` to match the Dockerfile
    pattern and preserve the local-dev UX (these previously pointed at the
    deleted src/db/seed.ts via tsx).

Security review: GRO-2128 LOW-1 (informational).

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/package.json

@@ -12,8 +12,8 @@
     "test": "vitest run",
     "db:generate": "drizzle-kit generate",
     "db:migrate": "drizzle-kit migrate",
-    "db:seed": "tsx src/db/seed.ts",
-    "db:reset": "tsx src/db/reset.ts && drizzle-kit migrate && tsx src/db/seed.ts",
+    "db:seed": "pnpm --filter @groombook/db seed",
+    "db:reset": "pnpm --filter @groombook/db reset",
     "db:studio": "drizzle-kit studio"
   },
   "dependencies": {