Add centralized API client with axios interceptors, remove vue-axios

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/stores/login.test.js

@@ -7,11 +7,16 @@ vi.mock('@/module/apiError.js', () => ({
 }));
 
 import axios from 'axios';
+
+const { mockClientGet } = vi.hoisted(() => ({ mockClientGet: vi.fn() }));
+vi.mock('@/api/client.js', () => ({
+  default: { get: mockClientGet },
+}));
+
 import useLoginStore from '@/stores/login.ts';
 
-// Mock axios methods
+// Mock axios methods (used for signIn/refreshToken which call plain axios)
 vi.spyOn(axios, 'post').mockImplementation(vi.fn());
-vi.spyOn(axios, 'get').mockImplementation(vi.fn());
 
 describe('loginStore', () => {
   let store;
@@ -118,13 +123,13 @@ describe('loginStore', () => {
 
   describe('getUserData', () => {
     it('stores user data on success', async () => {
-      axios.get.mockResolvedValue({
+      mockClientGet.mockResolvedValue({
         data: { username: 'testuser', name: 'Test User' },
       });
 
       await store.getUserData();
 
-      expect(axios.get).toHaveBeenCalledWith('/api/my-account');
+      expect(mockClientGet).toHaveBeenCalledWith('/api/my-account');
       expect(store.userData).toEqual({
         username: 'testuser',
         name: 'Test User',
@@ -134,7 +139,7 @@ describe('loginStore', () => {
 
   describe('checkLogin', () => {
     it('does not redirect on success', async () => {
-      axios.get.mockResolvedValue({ data: {} });
+      mockClientGet.mockResolvedValue({ data: {} });
 
       await store.checkLogin();
 
@@ -142,7 +147,7 @@ describe('loginStore', () => {
     });
 
     it('redirects to login on error', async () => {
-      axios.get.mockRejectedValue(new Error('401'));
+      mockClientGet.mockRejectedValue(new Error('401'));
 
       await store.checkLogin();
 
@@ -186,10 +191,6 @@ describe('loginStore', () => {
         }),
       );
 
-      // Should update axios default Authorization header
-      expect(axios.defaults.headers.common['Authorization'])
-        .toBe('Bearer new-access-token');
-
       // Verify cookies were set with Secure flag
       const cookieSetter = vi.spyOn(document, 'cookie', 'set');
       vi.clearAllMocks();