REFACTORED - Replace Prisma with Drizzle ORM

- Add lib/db (schema, postgres.js client, enums, seed, migrations) on Drizzle
- Rewrite all lib and admin action queries from Prisma to Drizzle
- Keep existing table/column names so no data migration is needed
- Preserve signed-cookie admin auth unchanged
- Map unique-violation handling from Prisma P2002 to SQLSTATE 23505
- Swap deps, scripts, Makefile, and Dockerfile from Prisma to Drizzle

lib/db/enums.ts

@@ -0,0 +1,56 @@
+// Shared enum values + types. NO server/ORM imports here — this file is safe to
+// import from client components (replaces the old `@prisma/client` enum imports).
+//
+// Defined as `const object + union type` (the same shape Prisma generated) rather
+// than a TS `enum`, so bare string literals like "IMAGE" stay assignable and
+// `z.nativeEnum(...)` keeps working.
+
+export const PortfolioSectionType = {
+  RICH_TEXT: "RICH_TEXT",
+  GALLERY: "GALLERY",
+  STATS: "STATS",
+  DELIVERABLES: "DELIVERABLES",
+  LINK: "LINK",
+} as const;
+export type PortfolioSectionType = (typeof PortfolioSectionType)[keyof typeof PortfolioSectionType];
+
+export const PortfolioAssetKind = {
+  IMAGE: "IMAGE",
+  DOCUMENT: "DOCUMENT",
+} as const;
+export type PortfolioAssetKind = (typeof PortfolioAssetKind)[keyof typeof PortfolioAssetKind];
+
+export const PortfolioProjectViewMode = {
+  GRID: "GRID",
+  STORY: "STORY",
+  CASE_STUDY: "CASE_STUDY",
+} as const;
+export type PortfolioProjectViewMode =
+  (typeof PortfolioProjectViewMode)[keyof typeof PortfolioProjectViewMode];
+
+export const MediaSource = {
+  UPLOAD: "UPLOAD",
+  EXTERNAL: "EXTERNAL",
+} as const;
+export type MediaSource = (typeof MediaSource)[keyof typeof MediaSource];
+
+export const MediaKind = {
+  IMAGE: "IMAGE",
+  DOCUMENT: "DOCUMENT",
+} as const;
+export type MediaKind = (typeof MediaKind)[keyof typeof MediaKind];
+
+export const MediaUsageType = {
+  PORTFOLIO_COVER: "PORTFOLIO_COVER",
+  PORTFOLIO_SECTION: "PORTFOLIO_SECTION",
+  PORTFOLIO_ASSET: "PORTFOLIO_ASSET",
+  GENERIC: "GENERIC",
+} as const;
+export type MediaUsageType = (typeof MediaUsageType)[keyof typeof MediaUsageType];
+
+// Helper: enum-object -> tuple of its string values, for Drizzle pgEnum(...).
+// Preserves the literal union (not widened to `string`) so pgEnum columns infer
+// as the exact union type.
+export function enumValues<T extends Record<string, string>>(e: T): [T[keyof T], ...T[keyof T][]] {
+  return Object.values(e) as [T[keyof T], ...T[keyof T][]];
+}