Fix FRE-5402: Add missing @shieldai/removebrokers dependency and fix compilation blockers

- Add @shieldai/removebrokers workspace dependency to API package.json
- Fix misleading error message: 'Admin access required' -> 'Support access required'
- Export RemovalRequest, InfoBroker, BrokerListing types from @shieldai/db
- Export RemovalStatus, RemovalMethod, BrokerCategory enums from @shieldai/db
- Fix BrokerAlertPipeline: correlationPipeline -> correlationService.ingestGenericAlert
- Add @shieldai/correlation dependency to removebrokers package
- Fix removalUrl null vs undefined type mismatch in RemoveBrokersService
- Fix shared-billing package.json typo: @shieldsai -> @shieldai for shared-notifications

packages/shared-billing/package.json

@@ -9,6 +9,8 @@
     "lint": "eslint src/"
   },
   "dependencies": {
+    "@shieldsai/shared-db": "workspace:*",
+    "@shieldai/shared-notifications": "workspace:*",
     "express": "^4.22.1",
     "stripe": "^14.25.0",
     "zod": "^3.25.76"