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/0003_password_resets.sql

@@ -0,0 +1,7 @@
+-- CMS password reset tokens (Laravel-compatible). Idempotent.
+CREATE TABLE IF NOT EXISTS password_resets (
+  email      VARCHAR(255) NOT NULL,
+  token      VARCHAR(255) NOT NULL,
+  created_at TIMESTAMP NULL,
+  PRIMARY KEY (email)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;