test(e2e): add playwright e2e stand with test pocketbase and axe checks

- playwright.config.ts: test PocketBase (port 8190) and ng serve (port 4300)
  as webServers, SIGTERM shutdown so the stand removes its temp dir
- fixtures: user via open registration, api SDK client, signedInPage with pb_auth cookie
- expectNoA11yViolations runs all axe rules (WCAG and best-practice)
- render home route on the server; main and h1 placeholder in app shell
- config tests for playwright.config.ts in test:lint; docs updated

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/lint/playwright-config.spec.ts

@@ -0,0 +1,86 @@
+// Проверяет playwright.config.ts: режим CI, где искать тесты, браузер, артефакты падений и тестовый PocketBase.
+import type { PlaywrightTestConfig } from '@playwright/test';
+import { execFileSync } from 'node:child_process';
+import { resolve } from 'node:path';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+async function loadConfig(ci: string | undefined): Promise<PlaywrightTestConfig> {
+    vi.stubEnv('CI', ci);
+    vi.resetModules();
+    return (await import('../../playwright.config')).default;
+}
+
+function webServers(config: PlaywrightTestConfig) {
+    const { webServer } = config;
+    return webServer === undefined ? [] : [webServer].flat();
+}
+
+function isGitIgnored(path: string): boolean {
+    try {
+        execFileSync('git', ['check-ignore', '-q', path]);
+        return true;
+    } catch {
+        return false;
+    }
+}
+
+describe('конфиг Playwright', () => {
+    afterEach(() => vi.unstubAllEnvs());
+
+    it('при CI=true: retries 1, ни один webServer не переиспользуется', async () => {
+        const config = await loadConfig('true');
+
+        expect(config.retries).toBe(1);
+        expect(webServers(config)).not.toHaveLength(0);
+        for (const server of webServers(config)) expect(server.reuseExistingServer).toBe(false);
+    });
+
+    it('без CI: webServer переиспользуются, retries 0', async () => {
+        const config = await loadConfig(undefined);
+
+        expect(config.retries ?? 0).toBe(0);
+        expect(webServers(config)).not.toHaveLength(0);
+        for (const server of webServers(config)) expect(server.reuseExistingServer).toBe(true);
+    });
+
+    it('ищет тесты tests/e2e/**/*.e2e.ts', async () => {
+        const config = await loadConfig(undefined);
+
+        expect(resolve(config.testDir ?? '.')).toBe(resolve('tests/e2e'));
+        expect(config.testMatch).toBe('**/*.e2e.ts');
+    });
+
+    it('только Chromium', async () => {
+        const config = await loadConfig(undefined);
+
+        expect(config.projects?.length).toBeGreaterThan(0);
+        for (const project of config.projects ?? []) {
+            expect(project.use?.browserName ?? project.use?.defaultBrowserType).toBe('chromium');
+        }
+    });
+
+    it('сохраняет трейс и скриншот при падении в папку, игнорируемую git', async () => {
+        const config = await loadConfig(undefined);
+
+        expect(config.use?.screenshot).toBe('only-on-failure');
+        expect(['retain-on-failure', 'retain-on-first-failure', 'on-first-retry']).toContain(
+            config.use?.trace,
+        );
+        expect(isGitIgnored(resolve(config.outputDir ?? 'test-results'))).toBe(true);
+    });
+
+    it('приложение смотрит на тестовый PocketBase, а не на dev', async () => {
+        const config = await loadConfig(undefined);
+        const servers = webServers(config);
+        const app = servers.find((s) => s.env?.['PB_URL']);
+        const pbUrl = app?.env?.['PB_URL'] ?? '';
+        const pocketBase = servers.find((s) => s !== app && s.url?.startsWith(pbUrl));
+
+        expect(pbUrl).not.toBe('');
+        expect(pocketBase).toBeDefined();
+        expect(new URL(pbUrl).port).not.toBe('8090');
+        expect(config.use?.baseURL).toBeDefined();
+        expect(new URL(config.use?.baseURL ?? '').port).not.toBe('4200');
+        expect(new URL(app?.url ?? '').origin).toBe(new URL(config.use?.baseURL ?? '').origin);
+    });
+});