refactor: replace Vuex with Pinia

src/stores/index.ts

@@ -0,0 +1,16 @@
+import { createPinia } from 'pinia'
+import piniaPluginPersistedstate from 'pinia-plugin-persistedstate'
+
+// 创建 Pinia 实例
+const pinia = createPinia()
+
+// 使用持久化插件
+pinia.use(piniaPluginPersistedstate)
+
+export default pinia
+
+// 所有的 store
+import { useAuthStore } from './auth'
+import { useUserStore } from './user'
+
+export { useAuthStore, useUserStore }