Consolidate @shieldai/db and @shieldsai/shared-db packages (FRE-4603)

- Merged singleton pattern + type exports from shared-db
- Kept FieldEncryptionService from original db package
- Upgraded to Prisma v6.2.0 (newer version)
- Adopted shared-db's complete schema for multi-service platform
- Updated 17 consumer imports across darkwatch, voiceprint, jobs, api
- Standardized on @shieldai/db namespace

Files changed:
- packages/db/package.json (v0.1.0 → v0.2.0)
- packages/db/src/index.ts (consolidated exports)
- packages/db/prisma/schema.prisma (merged schema)
- packages/db/prisma/seed.ts (updated for new schema)
- 17 consumer files updated

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

packages/db/src/index.ts

@@ -1,7 +1,71 @@
+// ============================================
+// Consolidated @shieldai/db package
+// ============================================
+// Merges functionality from:
+// - @shieldai/db (Prisma v6.2.0, FieldEncryptionService)
+// - @shieldsai/shared-db (singleton pattern, type exports)
+// ============================================
+
 import { PrismaClient } from '@prisma/client';
 import { FieldEncryptionService } from './services/field-encryption.service';
 
-export const prisma = new PrismaClient();
+// ============================================
+// Singleton Pattern (from shared-db)
+// ============================================
+const globalForPrisma = globalThis as unknown as {
+  prisma: PrismaClient | undefined;
+};
+
+export const prisma =
+  globalForPrisma.prisma ??
+  new PrismaClient({
+    log: process.env.NODE_ENV === 'development' ? ['query', 'error', 'warn'] : ['error'],
+  });
+
+if (process.env.NODE_ENV === 'development') {
+  globalForPrisma.prisma = prisma;
+}
+
 export default prisma;
+
+// ============================================
+// Services (from @shieldai/db)
+// ============================================
 export { FieldEncryptionService };
+
+// ============================================
+// Type Exports (from shared-db)
+// ============================================
+export type {
+  User,
+  Account,
+  Session,
+  FamilyGroup,
+  FamilyGroupMember,
+  Subscription,
+  WatchlistItem,
+  Exposure,
+  Alert,
+  VoiceEnrollment,
+  VoiceAnalysis,
+  SpamFeedback,
+  SpamRule,
+  AuditLog,
+  KPISnapshot,
+  UserRole,
+  FamilyMemberRole,
+  SubscriptionTier,
+  SubscriptionStatus,
+  WatchlistType,
+  ExposureSource,
+  ExposureSeverity,
+  AlertType,
+  AlertSeverity,
+  AlertChannel,
+  FeedbackType,
+  RuleType,
+  RuleAction,
+} from '@prisma/client';
+
+export * as PrismaModels from '@prisma/client';
 export type { PrismaClient };