feat: 添加用户设置功能，支持修改昵称和邮箱，重构相关路由和组件

src/router/index.ts

@@ -53,7 +53,25 @@ const routes: Array<RouteRecordRaw> = [
   },
   {
     path: "/user/settings",
-    component: () => import("@/views/user/settings.vue"),
+    component: () => import("@/views/user-settings/outlet.vue"),
+    children: [
+      {
+        path: "",
+        component: () => import("@/views/user-settings/index.vue"),
+      },
+      {
+        path: "username",
+        component: () => import("@/views/user-settings/username.vue"),
+      },
+      {
+        path: "nickname",
+        component: () => import("@/views/user-settings/nickname.vue"),
+      },
+      {
+        path: "email",
+        component: () => import("@/views/user-settings/email.vue"),
+      },
+    ],
   },
   {
     path: "/system-settings",