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/app-config.test.ts

@@ -20,7 +20,10 @@ import {
   updateMarqueeSettings,
   updateSiteSettings,
 } from "@/lib/app-config";
-import { prisma } from "@/lib/prisma";
+import { eq } from "drizzle-orm";
+
+import { db } from "@/lib/db";
+import { appConfig, mediaUsage } from "@/lib/db/schema";
 import { createMediaAsset } from "@/tests/helpers/factories";
 
 describe("maintenance mode", () => {
@@ -31,7 +34,7 @@ describe("maintenance mode", () => {
   it("persists and reads back the enabled flag", async () => {
     await setMaintenanceMode(true);
     expect(await getMaintenanceMode()).toBe(true);
-    const row = await prisma.appConfig.findUnique({ where: { key: MAINTENANCE_MODE_KEY } });
+    const row = await db.query.appConfig.findFirst({ where: eq(appConfig.key, MAINTENANCE_MODE_KEY) });
     expect(row?.value).toBe("true");
     await setMaintenanceMode(false);
     expect(await getMaintenanceMode()).toBe(false);
@@ -46,7 +49,7 @@ describe("site settings", () => {
   });
 
   it("uses the stored siteName key as the fallback name", async () => {
-    await prisma.appConfig.create({ data: { key: SITE_NAME_KEY, value: "My Studio" } });
+    await db.insert(appConfig).values({ key: SITE_NAME_KEY, value: "My Studio" });
     const settings = await getSiteSettings();
     expect(settings.locales.ar.siteName).toBe("My Studio");
   });
@@ -113,24 +116,20 @@ describe("getSiteSettingsMediaBindings", () => {
   it("maps media usages to their field bindings", async () => {
     const logo = await createMediaAsset({ url: "https://cdn/logo.png" });
     const favicon = await createMediaAsset({ url: "https://cdn/favicon.svg" });
-    await prisma.mediaUsage.create({
-      data: {
+    await db.insert(mediaUsage).values({
         assetId: logo.id,
         usageType: "GENERIC",
         entityType: SITE_SETTINGS_ENTITY_TYPE,
         entityId: SITE_SETTINGS_ENTITY_ID,
         fieldKey: SITE_SETTINGS_LOGO_LIGHT_FIELD_KEY,
-      },
-    });
-    await prisma.mediaUsage.create({
-      data: {
+      });
+    await db.insert(mediaUsage).values({
         assetId: favicon.id,
         usageType: "GENERIC",
         entityType: SITE_SETTINGS_ENTITY_TYPE,
         entityId: SITE_SETTINGS_ENTITY_ID,
         fieldKey: SITE_SETTINGS_FAVICON_FIELD_KEY,
-      },
-    });
+      });
 
     const bindings = await getSiteSettingsMediaBindings();
     expect(bindings.siteLogoLight?.assetId).toBe(logo.id);