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/ci-workflow-contract.test.ts

@@ -36,6 +36,7 @@ describe("CI workflow", () => {
 		const release = workflow.slice(workflow.indexOf("\n  release:"));
 		expect(release).toContain("pnpm db:migrate");
 		expect(release).not.toContain("pnpm prisma:generate");
+		expect(release).toContain("pnpm db:migrate");
 		expect(release).toContain("src/db/schema.ts");
 		const migrateAt = release.indexOf("pnpm db:migrate");
 		const buildAt = release.indexOf("pnpm build");