Add e2e test suite from flights-front with Angular API mocks

Copies Playwright e2e tests (58 specs, 300+ tests) designed for cross-app
testing. Adapts API mocks to match real Aeroflot dictionary format (title
objects with multilingual keys), adds board/schedule/days endpoint mocks,
and provides Angular-specific Playwright config on port 4203.

.gitignore

@@ -46,6 +46,6 @@ onlineboard-*.png
 
 # Coverage output
 coverage/
-tests/e2e-angular/
 test-results/
-playwright-angular.config.ts
+test-results-angular/
+playwright-report-angular/