feat: add API client and services for medicines, pharmacies, auth

frontend-mobile/services/auth.ts

@@ -0,0 +1,43 @@
+import api from './api';
+import * as SecureStore from 'expo-secure-store';
+import { AuthResponse, User } from '../types';
+
+export async function login(username: string, password: string): Promise<AuthResponse> {
+  const response = await api.post('/auth/login', { username, password });
+  const { user, token } = response.data;
+
+  await SecureStore.setItemAsync('auth_token', token);
+  await SecureStore.setItemAsync('user', JSON.stringify(user));
+
+  return response.data;
+}
+
+export async function logout(): Promise<void> {
+  await api.post('/auth/logout');
+  await SecureStore.deleteItemAsync('auth_token');
+  await SecureStore.deleteItemAsync('user');
+}
+
+export async function checkAuth(): Promise<User | null> {
+  try {
+    const response = await api.get('/auth/check');
+    return response.data.user;
+  } catch {
+    return null;
+  }
+}
+
+export async function getStoredUser(): Promise<User | null> {
+  const userStr = await SecureStore.getItemAsync('user');
+  return userStr ? JSON.parse(userStr) : null;
+}
+
+export async function register(username: string, password: string): Promise<AuthResponse> {
+  const response = await api.post('/auth/register', { username, password });
+  const { user, token } = response.data;
+
+  await SecureStore.setItemAsync('auth_token', token);
+  await SecureStore.setItemAsync('user', JSON.stringify(user));
+
+  return response.data;
+}