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

frontend-mobile/services/api.ts

@@ -0,0 +1,36 @@
+import axios from 'axios';
+import * as SecureStore from 'expo-secure-store';
+import { config } from '../constants/config';
+
+export const api = axios.create({
+  baseURL: config.API_BASE_URL,
+  timeout: 10000,
+  headers: {
+    'Content-Type': 'application/json',
+  },
+});
+
+// Request interceptor - add auth token
+api.interceptors.request.use(
+  async (axiosConfig) => {
+    const token = await SecureStore.getItemAsync('auth_token');
+    if (token) {
+      axiosConfig.headers.Authorization = `Bearer ${token}`;
+    }
+    return axiosConfig;
+  },
+  (error) => Promise.reject(error)
+);
+
+// Response interceptor - handle errors
+api.interceptors.response.use(
+  (response) => response,
+  async (error) => {
+    if (error.response?.status === 401) {
+      await SecureStore.deleteItemAsync('auth_token');
+    }
+    return Promise.reject(error);
+  }
+);
+
+export default api;