添加 vue-router 依赖并配置路由，重构登录组件，完善 HTTP 请求拦截器以支持 token 刷新机制

package-lock.json

@@ -10,7 +10,8 @@
       "dependencies": {
         "axios": "^1.7.7",
         "element-plus": "^2.8.8",
-        "vue": "^3.4.38"
+        "vue": "^3.4.38",
+        "vue-router": "^4.4.5"
       },
       "devDependencies": {
         "@vitejs/plugin-vue": "^5.1.4",
@@ -886,6 +887,12 @@
         "@vue/shared": "3.5.19"
       }
     },
+    "node_modules/@vue/devtools-api": {
+      "version": "6.6.4",
+      "resolved": "https://registry.npmjs.org/@vue/devtools-api/-/devtools-api-6.6.4.tgz",
+      "integrity": "sha512-sGhTPMuXqZ1rVOk32RylztWkfXTRhuS7vgAKv0zjqk8gbsHkJ7xfFf+jbySxt7tWObEJwyKaHMikV/WGDiQm8g==",
+      "license": "MIT"
+    },
     "node_modules/@vue/reactivity": {
       "version": "3.5.19",
       "resolved": "https://registry.npmjs.org/@vue/reactivity/-/reactivity-3.5.19.tgz",
@@ -1650,6 +1657,21 @@
           "optional": true
         }
       }
+    },
+    "node_modules/vue-router": {
+      "version": "4.5.1",
+      "resolved": "https://registry.npmjs.org/vue-router/-/vue-router-4.5.1.tgz",
+      "integrity": "sha512-ogAF3P97NPm8fJsE4by9dwSYtDwXIY1nFY9T6DyQnGHd1E2Da94w9JIolpe42LJGIl0DwOHBi8TcRPlPGwbTtw==",
+      "license": "MIT",
+      "dependencies": {
+        "@vue/devtools-api": "^6.6.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/posva"
+      },
+      "peerDependencies": {
+        "vue": "^3.2.0"
+      }
     }
   }
 }