feat: 新增二级菜单子导航系统（SubNav + redirectMenu）

- 新增 SubNav 组件：Navbar 下方水平子导航条，展示当前二级菜单下的三级页面，支持滚动和下拉分组
- 新增 redirectMenu 页面：点击二级菜单时卡片式展示子页面列表
- SidebarItem 深度 >=1 时改为叶子节点渲染（小圆点标记），激活高亮回退到二级菜单
- Navbar 布局重构为 Flexbox，面包屑/SubNav 根据场景切换
- 新增 productionLine Vuex 模块，轧辊研磨页改为 store 方式读取产线数据
- Sidebar activeMenu 逻辑增强：自动定位当前页所属二级菜单

klp-ui/src/store/getters.js

@@ -23,5 +23,6 @@ const getters = {
   bomMap: state => state.category.bomMap,
   financialAccounts: state => state.finance.financialAccounts,
   processList: state => state.craft.processList,
+  productionLines: state => state.productionLine.productionLines,
 }
 export default getters

klp-ui/src/store/index.js

@@ -9,6 +9,7 @@ import settings from './modules/settings'
 import category from './modules/category'
 import finance from './modules/finance'
 import craft from './modules/craft'
+import productionLine from './modules/productionLine'
 import getters from './getters'
 
 Vue.use(Vuex)
@@ -23,7 +24,8 @@ const store = new Vuex.Store({
     settings,
     category,
     finance,
-    craft
+    craft,
+    productionLine
   },
   getters
 })

klp-ui/src/store/modules/productionLine.js

@@ -0,0 +1,27 @@
+import { listProductionLine } from "@/api/wms/productionLine";
+
+const state = {
+  productionLines: [],
+}
+
+const mutations = {
+  SET_PRODUCTION_LINES(state, list) {
+    state.productionLines = list;
+  },
+}
+
+const actions = {
+  getProductionLines({ commit, state }) {
+    if (state.productionLines.length > 0) return Promise.resolve()
+    return listProductionLine({ pageNum: 1, pageSize: 100 }).then(response => {
+      commit('SET_PRODUCTION_LINES', response.rows || []);
+    });
+  }
+}
+
+export default {
+  namespaced: true,
+  state,
+  mutations,
+  actions
+}