feat: add SingleRecordMnt component for student record maintenance with search, add, edit, view, and delete functionalities

src/services/token.ts

@@ -0,0 +1,25 @@
+import { ref } from 'vue'
+
+// Token Service
+//
+// 設計重點：
+// - 單一來源（Single Source of Truth）：用 ref 維護 token，並同步 localStorage
+// - Store 與 Interceptor 只透過此 service 讀寫 token，避免來源分裂
+
+const storageKey = 'token'
+const tokenRef = ref<string | null>(localStorage.getItem(storageKey))
+
+export const tokenService = {
+  token: tokenRef,
+  getToken() {
+    return tokenRef.value
+  },
+  setToken(nextToken: string) {
+    tokenRef.value = nextToken
+    localStorage.setItem(storageKey, nextToken)
+  },
+  clearToken() {
+    tokenRef.value = null
+    localStorage.removeItem(storageKey)
+  }
+}