fix(frontend): 优化网页标题设置逻辑

- 添加 SET_TITLE mutation 用于直接设置标题
- 修改 setTitle action，通过 commit调用 SET_TITLE mutation

Signed-off-by: Zhu-meng <lian62978@outlook.com>

ruoyi-ui/src/store/modules/settings.js

@@ -23,6 +23,9 @@ const mutations = {
     if (state.hasOwnProperty(key)) {
       state[key] = value
     }
+  },
+  SET_TITLE: (state, title) => {
+    state.title = title
   }
 }
 
@@ -33,7 +36,7 @@ const actions = {
   },
   // 设置网页标题
   setTitle({ commit }, title) {
-    state.title = title
+    commit('SET_TITLE', title)
     useDynamicTitle()
   }
 }