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>

vitest.config.ts

@@ -0,0 +1,21 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: 'node',
+    deps: {
+      interopDefault: true,
+    },
+    env: {
+      HIYA_API_KEY: 'test-api-key',
+      HIYA_API_URL: 'https://api.hiya.com/v1',
+    },
+  },
+  optimizeDeps: {
+    include: ['ws'],
+  },
+  ssr: {
+    noExternal: ['ws'],
+  },
+});