Replace rollup-plugin-license with rolldown-license-plugin (#37130)

Replace `rollup-plugin-license` and `wrap-ansi` with
[`rolldown-license-plugin`](https://github.com/silverwind/rolldown-license-plugin),
a zero-dependency plugin with async parallel I/O and built-in word
wrapping.

- Removes `rollup-plugin-license` (pulls in `lodash`, `moment`) and
`wrap-ansi` from the dependency tree
- License build time reduced by ~40% (370ms vs 640ms)
- Added e2e test for `licenses.txt`

Signed-off-by: silverwind <me@silverwind.io>
Co-authored-by: Claude (Opus 4.6) <noreply@anthropic.com>

tests/e2e/licenses.test.ts

@@ -0,0 +1,9 @@
+import {test, expect} from '@playwright/test';
+
+test('licenses.txt', async ({page}) => {
+  const resp = await page.goto('/assets/licenses.txt');
+  expect(resp?.status()).toBe(200);
+  const content = await resp!.text();
+  expect(content).toContain('@vue/');
+  expect(content).toContain('code.gitea.io/');
+});