feat: 优化用户设置路由和界面，简化返回按钮实现

src/router/index.ts

@@ -96,48 +96,38 @@ const routes: Array<RouteRecordRaw> = [
   },
   {
     path: "/user/settings",
-    component: () => import("@/views/user-settings/outlet.vue"),
+    component: () => import("@/views/user-settings/index.vue"),
+    meta: { requiresAuth: true },
+  },
+  {
+    path: "/user/settings/username",
+    component: () => import("@/views/user-settings/username.vue"),
+    meta: { requiresAuth: true },
+  },
+  {
+    path: "/user/settings/nickname",
+    component: () => import("@/views/user-settings/nickname.vue"),
+    meta: { requiresAuth: true },
+  },
+  {
+    path: "/user/settings/email",
+    component: () => import("@/views/user-settings/email.vue"),
     meta: { requiresAuth: true },
-    children: [
-      {
-        path: "",
-        component: () => import("@/views/user-settings/index.vue"),
-        meta: { requiresAuth: true },
-      },
-      {
-        path: "username",
-        component: () => import("@/views/user-settings/username.vue"),
-        meta: { requiresAuth: true },
-      },
-      {
-        path: "nickname",
-        component: () => import("@/views/user-settings/nickname.vue"),
-        meta: { requiresAuth: true },
-      },
-      {
-        path: "email",
-        component: () => import("@/views/user-settings/email.vue"),
-        meta: { requiresAuth: true },
-      },
-    ],
   },
   {
     path: "/system-settings",
-    component: () => import("@/views/system-settings/outlet.vue"),
-    children: [
-      {
-        path: "",
-        component: () => import("@/views/system-settings/index.vue"),
-      },
-      {
-        path: "language",
-        component: () => import("@/views/system-settings/language.vue"),
-      },
-      {
-        path: "theme",
-        component: () => import("@/views/system-settings/theme.vue"),
-      },
-    ],
+    component: () => import("@/views/system-settings/index.vue"),
+    meta: { requiresAuth: true },
+  },
+  {
+    path: "/system-settings/language",
+    component: () => import("@/views/system-settings/language.vue"),
+    meta: { requiresAuth: true },
+  },
+  {
+    path: "/system-settings/theme",
+    component: () => import("@/views/system-settings/theme.vue"),
+    meta: { requiresAuth: true },
   },
   {
     path: "/issue/issuing-apply",