refactor(axios): globalize baseURL setting

- Create axiosConfig.js to set axios defaults
- Replace direct axios imports with configured instance from axiosConfig.js

frontend/src/axiosConfig.js

+import axios from 'axios';
+
+axios.defaults.baseURL = 'http://localhost:8080';
+
+export default axios;
\ No newline at end of file

frontend/src/components/auth/Login.vue

@@ -23,11 +23,9 @@
 </template>
 
 <script>
-import axios from 'axios';
+import axios from '@/axiosConfig.js';
 import {mapState} from "vuex";
 
-axios.defaults.baseURL = 'http://localhost:8080';
-
 export default {
   name: 'Login',
   computed: {

frontend/src/components/auth/Register.vue

@@ -15,9 +15,7 @@
 </template>
 
 <script>
-import axios from 'axios';
-
-axios.defaults.baseURL = 'http://localhost:8080';
+import axios from '@/axiosConfig.js';
 
 export default {
   name: 'Register',

frontend/src/components/dogs/AddDog.vue

@@ -20,7 +20,7 @@
 </template>
 
 <script>
-import axios from 'axios';
+import axios from '@/axiosConfig.js';
 import { mapState } from 'vuex';
 
 export default {

frontend/src/components/dogs/AllDogs.vue

@@ -20,9 +20,7 @@
 
 
 <script>
-import axios from 'axios';
-
-axios.defaults.baseURL = 'http://localhost:8080';
+import axios from '@/axiosConfig.js';
 
 export default {
   name: 'AllDogs',

frontend/src/components/dogs/EditDog.vue

@@ -20,7 +20,7 @@
 </template>
 
 <script>
-import axios from 'axios';
+import axios from '@/axiosConfig.js';
 import { mapState } from 'vuex';
 
 export default {

frontend/src/components/dogs/SingleDog.vue

@@ -11,9 +11,7 @@
 </template>
 
 <script>
-import axios from 'axios';
-
-axios.defaults.baseURL = 'http://localhost:8080';
+import axios from '@/axiosConfig.js';
 
 export default {
   name: 'SingleDog',