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/pages/RegisterPage.ts

@@ -0,0 +1,27 @@
+import { type Page } from '@playwright/test';
+import { BasePage } from '@levkin/playkit';
+
+export class RegisterPage extends BasePage {
+  constructor(page: Page, baseUrl: string) {
+    super(page, baseUrl);
+  }
+
+  async openRegister(): Promise<void> {
+    await this.open('/register');
+    await this.page.waitForLoadState('domcontentloaded');
+    await this.page.locator('#email').waitFor({ state: 'visible' });
+    await this.page.waitForTimeout(300);
+  }
+
+  async register(input: {
+    name: string;
+    email: string;
+    password: string;
+  }): Promise<void> {
+    await this.fill(this.page.locator('#name'), input.name);
+    await this.fill(this.page.locator('#email'), input.email);
+    await this.fill(this.page.locator('#password'), input.password);
+    await this.fill(this.page.locator('#confirmPassword'), input.password);
+    await this.click(this.page.locator('button[type="submit"]'));
+  }
+}