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/admin/acl-management-contract.test.ts

@@ -13,7 +13,7 @@ describe("ACL management contract", () => {
 
 	it("ships an idempotent ACL completion migration", () => {
 		const sql = readFileSync(
-			"prisma/migrations/0014_complete_acl_and_import_permissions.sql",
+			"drizzle/migrations/0014_complete_acl_and_import_permissions.sql",
 			"utf8",
 		);
 		expect(sql).toContain("admin.assets.import");