REFACTORED - migrate the data layer from Prisma to Drizzle (unify the stack)

- Add lib/db (Drizzle schema: 7 tables + 6 enums + relations, postgres.js client),
  drizzle.config.ts, lib/db/enums.ts (Prisma-compatible enum objects)
- Rewrite all 14 app consumers + 4 admin components to Drizzle
- Move the test DB layer to Drizzle + in-process PGlite; convert all 8 integration
  test files + factories (371 tests green)
- Remove Prisma: deps, prisma/ schema+migrations, lib/prisma.ts, Dockerfile prisma
  generate; wire db:generate/migrate/push/studio to drizzle-kit; update Makefile
- Preserve the old seed as scripts/legacy-prisma-seed.cjs (needs a Drizzle rewrite)

lib/db/index.ts

@@ -0,0 +1,26 @@
+import { drizzle } from "drizzle-orm/postgres-js";
+import postgres from "postgres";
+
+import * as schema from "./schema";
+
+/**
+ * The Drizzle database client (postgres.js driver), matching the house standard
+ * used by the other projects. Replaces the old Prisma client (`lib/prisma.ts`).
+ * A single connection is reused across hot reloads in dev.
+ */
+const connectionString =
+  process.env.DATABASE_URL ??
+  "postgresql://postgres:postgres@localhost:5432/moh_sass?schema=public";
+
+const globalForDb = globalThis as unknown as {
+  dbClient: ReturnType<typeof postgres> | undefined;
+};
+
+const client = globalForDb.dbClient ?? postgres(connectionString);
+
+if (process.env.NODE_ENV !== "production") {
+  globalForDb.dbClient = client;
+}
+
+export const db = drizzle(client, { schema });
+export { schema };