Sprint 9: add tenant-driven API resolution layer

src/app/interceptors/api-base-url.interceptor.ts

@@ -0,0 +1,18 @@
+import { HttpInterceptorFn } from '@angular/common/http';
+import { inject } from '@angular/core';
+import { ApiConfigService } from '../core/config/api-config.service';
+
+export const apiBaseUrlInterceptor: HttpInterceptorFn = (req, next) => {
+  const apiConfig = inject(ApiConfigService);
+
+  if (!req.url.startsWith('/api')) {
+    return next(req);
+  }
+
+  const resolvedUrl = apiConfig.toApiUrl(req.url);
+  if (resolvedUrl === req.url) {
+    return next(req);
+  }
+
+  return next(req.clone({ url: resolvedUrl }));
+};