feat(doc): move interop rxjs signal

apps/angular/interop-rxjs-signal/src/app/photos.service.ts

@@ -0,0 +1,39 @@
+import { HttpClient } from '@angular/common/http';
+import { Injectable, inject } from '@angular/core';
+import { Observable } from 'rxjs';
+import { Photo } from './photo.model';
+
+export interface FlickrAPIResponse {
+  photos: {
+    pages: number;
+    photo: Photo[];
+  };
+}
+
+@Injectable({ providedIn: 'root' })
+export class PhotoService {
+  private http = inject(HttpClient);
+
+  public searchPublicPhotos(
+    searchTerm: string,
+    page: number
+  ): Observable<FlickrAPIResponse> {
+    return this.http.get<FlickrAPIResponse>(
+      'https://www.flickr.com/services/rest/',
+      {
+        params: {
+          tags: searchTerm,
+          method: 'flickr.photos.search',
+          format: 'json',
+          nojsoncallback: '1',
+          tag_mode: 'all',
+          media: 'photos',
+          per_page: '30',
+          page,
+          extras: 'tags,date_taken,owner_name,url_q,url_m',
+          api_key: 'c3050d39a5bb308d9921bef0e15c437d',
+        },
+      }
+    );
+  }
+}