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)

tests/integration/api-routes.test.ts

@@ -3,7 +3,7 @@ import { afterEach, describe, expect, it, vi } from "vitest";
 import { GET as healthGet } from "@/app/api/health/route";
 import { GET as defaultLocaleGet } from "@/app/api/site/default-locale/route";
 import { setMaintenanceMode, updateSiteSettings, getSiteSettings } from "@/lib/app-config";
-import { prisma } from "@/lib/prisma";
+import { db } from "@/lib/db";
 
 afterEach(() => {
   vi.restoreAllMocks();
@@ -20,7 +20,7 @@ describe("GET /api/health", () => {
   });
 
   it("reports degraded (503) when the database query throws", async () => {
-    vi.spyOn(prisma, "$queryRaw").mockRejectedValueOnce(new Error("db down"));
+    vi.spyOn(db, "execute").mockRejectedValueOnce(new Error("db down"));
     const response = await healthGet();
     expect(response.status).toBe(503);
     const body = await response.json();