chore(db): finish Prisma cutover to Drizzle Kit tooling

Move CMS SQL to drizzle/migrations, drop prisma packages/schema, wire drizzle-kit scripts, and regenerate schema names from src/db/schema.ts.

Co-authored-by: Cursor <[email protected]>

src/components/public/photo-lightbox.tsx

@@ -10,7 +10,7 @@ import { useCallback, useEffect, useState } from "react";
  * toggled by state — closes on backdrop click, on the ✕ button, or with Esc.
  *
  * Photos are pre-shaped on the server (caption strings already translated) so
- * this component carries no prisma/i18n dependency.
+ * this component carries no db/i18n dependency.
  */
 export type LightboxPhoto = {
 	id: string;