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-auth/src/index.ts

@@ -0,0 +1,25 @@
+// Config
+export { authOptions, authEnv, userRoles } from './config/auth.config';
+export type { UserRole, FamilyGroup } from './config/auth.config';
+
+// Middleware
+export { withAuth, withRole, protectApiRoute } from './middleware/auth.middleware';
+
+// Models
+export {
+  userSchema,
+  familyGroupSchema,
+  familyMemberSchema,
+  sessionSchema,
+  accountSchema,
+  createUserSchema,
+  createFamilyGroupSchema,
+  addFamilyMemberSchema,
+} from './models/auth.models';
+export type {
+  User,
+  FamilyGroup as AuthFamilyGroup,
+  FamilyMember,
+  Session,
+  Account,
+} from './models/auth.models';