feat: migrate full Prisma schema to Drizzle ORM (29 tables, 28 enums, 25 relations)

- Install drizzle-orm, drizzle-kit, pg, @types/pg in web/
- Create split schema directory with domain files:
  - auth (users, accounts, sessions, deviceTokens)
  - subscription (familyGroups, familyGroupMembers, subscriptions)
  - darkwatch (watchlistItems, exposures)
  - alerts
  - voiceprint (voiceEnrollments, voiceAnalyses, analysisJobs, analysisResults)
  - spamshield (spamFeedback, spamRules)
  - audit (auditLogs, kpiSnapshots)
  - correlation (normalizedAlerts, correlationGroups)
  - reports (securityReports)
  - marketing (waitlistEntries, blogPosts)
  - hometitle (propertyWatchlistItems, propertySnapshots, propertyChanges)
  - removebrokers (infoBrokers, removalRequests, brokerListings)
- Define all 28 PostgreSQL enums via pgEnum()
- Define all indexes, unique constraints, and foreign keys
- Define all 25 relation definitions via relations() helper
- Update drizzle.config.ts for PostgreSQL dialect
- Update db/index.ts for node-postgres connection
- Replace old placeholder schema.ts with barrel re-export
- Add 38 comprehensive schema tests

web/drizzle.config.ts

@@ -1,12 +1,10 @@
 import { defineConfig } from "drizzle-kit";
 
 export default defineConfig({
-  schema: "./src/server/db/schema.ts",
+  schema: "./src/server/db/schema/index.ts",
   out: "./drizzle",
-  dialect: "sqlite",
-  driver: "turso",
+  dialect: "postgresql",
   dbCredentials: {
-    url: process.env.DATABASE_URL!,
-    authToken: process.env.DATABASE_AUTH_TOKEN,
+    url: process.env.DATABASE_URL ?? "postgresql://postgres:postgres@localhost:5432/shieldai",
   },
 });