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/enums.ts

@@ -0,0 +1,35 @@
+import {
+  mediaKind,
+  mediaSource,
+  mediaUsageType,
+  portfolioAssetKind,
+  portfolioProjectViewMode,
+  portfolioSectionType,
+} from "./schema";
+
+/**
+ * Prisma-compatible enum objects + types, derived from the Drizzle pgEnums, so
+ * existing consumers can keep writing `MediaKind.IMAGE` (value) and `: MediaKind`
+ * (type) — only the import path changes from `@prisma/client` to `@/lib/db/enums`.
+ */
+function asEnum<T extends string>(values: readonly T[]): { [K in T]: K } {
+  return Object.fromEntries(values.map((v) => [v, v])) as { [K in T]: K };
+}
+
+export const MediaKind = asEnum(mediaKind.enumValues);
+export type MediaKind = (typeof mediaKind.enumValues)[number];
+
+export const MediaSource = asEnum(mediaSource.enumValues);
+export type MediaSource = (typeof mediaSource.enumValues)[number];
+
+export const MediaUsageType = asEnum(mediaUsageType.enumValues);
+export type MediaUsageType = (typeof mediaUsageType.enumValues)[number];
+
+export const PortfolioAssetKind = asEnum(portfolioAssetKind.enumValues);
+export type PortfolioAssetKind = (typeof portfolioAssetKind.enumValues)[number];
+
+export const PortfolioProjectViewMode = asEnum(portfolioProjectViewMode.enumValues);
+export type PortfolioProjectViewMode = (typeof portfolioProjectViewMode.enumValues)[number];
+
+export const PortfolioSectionType = asEnum(portfolioSectionType.enumValues);
+export type PortfolioSectionType = (typeof portfolioSectionType.enumValues)[number];