FRE-4529: Transfer ShieldAI code from FrenoCorp repo

Transferred ShieldAI-related files mistakenly placed in ~/code/FrenoCorp:
- Services: spamshield (feature-flags, audit-logger, error-handler), voiceprint (config, service, feature-flags), darkwatch (pipeline, scan, scheduler, watchlist, webhook)
- Packages: shared-analytics, shared-auth, shared-ui, shared-utils (new); shared-billing, jobs supplemented with unique FC files
- Server: alerts (FC version newer), routes (spamshield, darkwatch, voiceprint)
- Config: turbo.json, tsconfig.base.json, vite/vitest configs, drizzle, Dockerfile
- VoicePrint ML service
- Examples

Pending: apps/{api,web,mobile}/ structured merge, shared-db/db mapping

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

packages/shared-analytics/src/index.ts

@@ -0,0 +1,18 @@
+// Config
+export {
+  analyticsEnv,
+  EventType,
+  eventPropertiesSchema,
+  kpiDefinitions,
+  alertThresholds,
+} from './config/analytics.config';
+
+// Services
+export {
+  MixpanelService,
+  mixpanelService,
+} from './services/mixpanel.service';
+export {
+  GA4Service,
+  ga4Service,
+} from './services/ga4.service';