Add cross-service alert correlation system FRE-4500

- Unified alert types (AlertSource, AlertCategory, CorrelationStatus, EntityType)
- NormalizedAlert and CorrelationGroup Prisma models
- AlertNormalizer for all 4 services (DarkWatch, SpamShield, VoicePrint, CallAnalysis)
- CorrelationEngine with temporal + entity-based correlation detection
- CorrelationService orchestrator with dashboard API
- Correlation API routes (/api/v1/correlation/*)
- Service emitters wired to DarkWatch, SpamShield, VoicePrint
- pnpm workspace config for monorepo

packages/correlation/src/index.ts

@@ -0,0 +1,9 @@
+export { alertNormalizer, AlertNormalizer } from "./normalizer";
+export { correlationEngine, CorrelationEngine } from "./engine";
+export { correlationService, CorrelationService } from "./service";
+export {
+  emitDarkWatchAlert,
+  emitSpamShieldAlert,
+  emitVoicePrintAlert,
+  emitCallAnalysisAlert,
+} from "./emitter";