feat: initial prototype works

I can log in and create a book! Woo!

apps/frontend/src/app/services/api.service.ts

@@ -0,0 +1,54 @@
+/**
+ * @copyright 2026 NHCarrigan
+ * @license Naomi's Public License
+ * @author Naomi Carrigan
+ */
+
+import { Injectable } from '@angular/core';
+import { HttpClient, HttpHeaders } from '@angular/common/http';
+import { Observable } from 'rxjs';
+import { environment } from '../../environments/environment';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class ApiService {
+  private readonly apiUrl = environment.apiUrl;
+
+  constructor(private http: HttpClient) {}
+
+  private getHeaders(): HttpHeaders {
+    // Auth token is sent as httpOnly cookie, no need to add manually
+    return new HttpHeaders({
+      'Content-Type': 'application/json'
+    });
+  }
+
+  get<T>(endpoint: string): Observable<T> {
+    return this.http.get<T>(`${this.apiUrl}${endpoint}`, {
+      headers: this.getHeaders(),
+      withCredentials: true // Important for cookies
+    });
+  }
+
+  post<T>(endpoint: string, body: any): Observable<T> {
+    return this.http.post<T>(`${this.apiUrl}${endpoint}`, body, {
+      headers: this.getHeaders(),
+      withCredentials: true
+    });
+  }
+
+  put<T>(endpoint: string, body: any): Observable<T> {
+    return this.http.put<T>(`${this.apiUrl}${endpoint}`, body, {
+      headers: this.getHeaders(),
+      withCredentials: true
+    });
+  }
+
+  delete<T>(endpoint: string): Observable<T> {
+    return this.http.delete<T>(`${this.apiUrl}${endpoint}`, {
+      headers: this.getHeaders(),
+      withCredentials: true
+    });
+  }
+}