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/playwright.config.ts

@@ -1,9 +1,8 @@
 import { defineConfig, devices } from '@playwright/test';
+import { DEFAULT_BASE_URL } from './env-defaults';
 
 const baseURL =
-  process.env.PLAYKIT_BASE_URL ||
-  process.env.BASE_URL ||
-  'https://punimtagdev.levkin.ca';
+  process.env.PLAYKIT_BASE_URL || process.env.BASE_URL || DEFAULT_BASE_URL;
 
 export default defineConfig({
   testDir: './tests',