Expand e2e auth coverage, Vitest CI, and shared URL defaults

Wire viewer-frontend Vitest into Gitea Actions, centralize DEV base URLs
in env-defaults.json, expand playkit API catalog specs, and land auth/mail
flows plus verify-email public-host redirect and idle-logout e2e hooks.

e2e/tests/auth.signout.spec.ts

@@ -39,7 +39,8 @@ test.describe('auth @smoke', () => {
     await timings.measure('login', async () => {
       await loginPage.openLogin();
       await loginPage.signIn(e2eCredentials!.email, e2eCredentials!.password);
-      await page.getByLabel('Account menu').waitFor({ state: 'visible' });
+      await page.waitForURL((url) => !url.pathname.includes('/login'), { timeout: 30_000 });
+      await page.getByLabel('Account menu').waitFor({ state: 'visible', timeout: 30_000 });
     });
 
     await waitForUrlHost(page, playkitConfig.expectedHost);