test(e2e): add comment, release, star, PR and fork tests (#37800)

Adds Playwright e2e coverage for five high-value workflows, each driven
through semantic locators with API-based setup:

- comment on and close an issue
- publish a release
- star and watch a repository
- create a pull request from the compare page
- fork a repository

Also passes `autoInit: false` in existing tests that only exercise
DB-backed units (issues, reactions, milestones, projects, events),
skipping an unused initial commit to speed up their setup and reduce
parallel git contention.

---
This PR was written with the help of Claude Opus 4.7

---------

Co-authored-by: Claude (Opus 4.7) <noreply@anthropic.com>
Co-authored-by: Nicolas <bircni@icloud.com>

tests/e2e/fork.test.ts

@@ -0,0 +1,18 @@
+import {env} from 'node:process';
+import {test, expect} from '@playwright/test';
+import {login, apiCreateRepo, apiCreateUser, apiUserHeaders, randomString} from './utils.ts';
+
+test('fork a repository', async ({page, request}) => {
+  const upstream = `fork-owner-${randomString(8)}`;
+  const repoName = `e2e-fork-${randomString(8)}`;
+  await apiCreateUser(request, upstream);
+  await Promise.all([
+    apiCreateRepo(request, {name: repoName, headers: apiUserHeaders(upstream)}),
+    login(page),
+  ]);
+  await page.goto(`/${upstream}/${repoName}/fork`);
+
+  await page.getByRole('button', {name: 'Fork Repository'}).click();
+  await page.waitForURL(new RegExp(`/${env.GITEA_TEST_E2E_USER}/${repoName}$`));
+  await expect(page.getByRole('link', {name: `${upstream}/${repoName}`})).toBeVisible();
+});