feat: add admin login

frontend/admin/src/stores/auth.js

@@ -0,0 +1,31 @@
+import { authService } from '@/api/authService';
+import { defineStore } from 'pinia';
+import { computed, ref } from 'vue';
+
+export const useAuthStore = defineStore('auth', () => {
+    const token = ref(localStorage.getItem('token'));
+    const user = ref(null);
+
+    const isAuthenticated = computed(() => !!token.value);
+
+    async function login(username, password) {
+        const { data } = await authService.login(username, password);
+        token.value = data.token;
+        user.value = data.user;
+        localStorage.setItem('token', data.token);
+    }
+
+    function logout() {
+        token.value = null;
+        user.value = null;
+        localStorage.removeItem('token');
+    }
+
+    return {
+        token,
+        user,
+        isAuthenticated,
+        login,
+        logout
+    };
+});