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/portfolio.test.ts

@@ -9,7 +9,10 @@ import {
   getPublishedPortfolioProjectBySlug,
   getPublishedPortfolioProjects,
 } from "@/lib/portfolio";
-import { prisma } from "@/lib/prisma";
+import { eq } from "drizzle-orm";
+
+import { db } from "@/lib/db";
+import { category, mediaUsage, portfolioAsset, portfolioProject, portfolioSection } from "@/lib/db/schema";
 import {
   createAsset,
   createCategory,
@@ -75,15 +78,13 @@ describe("admin projects", () => {
   it("attaches media bindings to a project fetched by id", async () => {
     const project = await createProject();
     const cover = await createMediaAsset();
-    await prisma.mediaUsage.create({
-      data: {
+    await db.insert(mediaUsage).values({
         assetId: cover.id,
         usageType: "PORTFOLIO_COVER",
         entityType: "portfolio-project",
         entityId: project.id,
         fieldKey: "cover",
-      },
-    });
+      });
     const detail = await getAdminPortfolioProjectById(project.id);
     expect(detail?.coverMediaAssetId).toBe(cover.id);
   });
@@ -127,15 +128,15 @@ describe("referential integrity", () => {
   it("restricts deleting a category that still has projects", async () => {
     const cat = await createCategory();
     await createProject({ categoryId: cat.id });
-    await expect(prisma.category.delete({ where: { id: cat.id } })).rejects.toThrow();
+    await expect(db.delete(category).where(eq(category.id, cat.id))).rejects.toThrow();
   });
 
   it("cascades section and asset deletion when a project is removed", async () => {
     const project = await createProject();
     await createSection(project.id);
     await createAsset(project.id);
-    await prisma.portfolioProject.delete({ where: { id: project.id } });
-    expect(await prisma.portfolioSection.count()).toBe(0);
-    expect(await prisma.portfolioAsset.count()).toBe(0);
+    await db.delete(portfolioProject).where(eq(portfolioProject.id, project.id));
+    expect(await db.$count(portfolioSection)).toBe(0);
+    expect(await db.$count(portfolioAsset)).toBe(0);
   });
 });