chore: align Node 26.7.0 toolchain

vitest.config.ts

@@ -17,7 +17,10 @@ export default defineConfig({
 		environment: "node",
 		// Modules under test transitively import @/env; skip its strict parse so
 		// unit tests run without a populated .env.
-		env: { SKIP_ENV_VALIDATION: "1" },
+		env: {
+			SKIP_ENV_VALIDATION: "1",
+			DATABASE_URL: "mysql://root:root@localhost:3306/test",
+		},
 		testTimeout: 10000,
 		exclude: ["e2e/**", "node_modules/**", ".next/**", ".next.prev/**"],
 		coverage: {