Sprint 9: add tenant-driven API resolution layer

src/app/services/api-health.service.ts

@@ -0,0 +1,14 @@
+import { Injectable, inject } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+import { Observable } from 'rxjs';
+import { ApiConfigService } from '../core/config/api-config.service';
+
+@Injectable({ providedIn: 'root' })
+export class ApiHealthService {
+  private readonly http = inject(HttpClient);
+  private readonly apiConfig = inject(ApiConfigService);
+
+  ping(): Observable<{ message: string }> {
+    return this.http.get<{ message: string }>(`${this.apiConfig.getBaseUrl()}/ping`);
+  }
+}