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/lib/permission-slugs.ts

@@ -1,6 +1,6 @@
 // ── Permission Slug Constants ───────────────────────────────────────
 // Extracted to its own file so it can be imported by client components
-// (modules.ts → sidebar.tsx) without pulling in prisma/server-only deps.
+// (modules.ts → sidebar.tsx) without pulling in db/server-only deps.
 
 export const PERMS = {
 	ADMIN_DASHBOARD: "admin.dashboard",