feat: add health check endpoint, file upload result handling, and Playwright E2E tests

- Add /health endpoint with anonymous access for monitoring
- Add FileUploadResult<T> model and PostMultipartForFileResultAsync for proper upload response handling
- Add ApiResult.Success() factory method for interface types
- Refactor Login.razor for cleaner code
- Add comprehensive Playwright E2E test suite with fixtures and helpers

TestScripts/playwright/helpers/index.ts

@@ -0,0 +1,29 @@
+/**
+ * Playwright Test Helpers for JDE Scoping Tool
+ *
+ * This module exports all helper functions for E2E testing.
+ */
+
+// Authentication helpers
+export * from './auth.helper';
+
+// Navigation helpers
+export * from './navigation.helper';
+
+// Search type helpers
+export * from './search-type.helper';
+
+// Date picker helpers
+export * from './date-picker.helper';
+
+// Autocomplete panel helpers
+export * from './autocomplete.helper';
+
+// File upload panel helpers
+export * from './file-upload.helper';
+
+// Radzen component helpers
+export * from './radzen.helper';
+
+// Form validation helpers
+export * from './validation.helper';