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]>

drizzle/migrations/0001_create_website_settings.sql

@@ -0,0 +1,10 @@
+-- CMS-owned settings table. Idempotent: safe to re-run.
+-- Mirrors AtomCMS's Laravel `website_settings` (key UNIQUE, value TEXT).
+CREATE TABLE IF NOT EXISTS website_settings (
+  id      BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
+  `key`   VARCHAR(255) NOT NULL,
+  value   TEXT NOT NULL,
+  comment VARCHAR(255) NULL,
+  PRIMARY KEY (id),
+  UNIQUE KEY website_settings_key_unique (`key`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;