docs: annotate remaining routes layouts and view boundaries

app/pages/bills/[id].vue

@@ -19,6 +19,7 @@ var a = defineComponent({
       composables_t({
         key: (e) => e.fullPath,
       }),
+      // 账单地址只复用订单详情视图，金额与付款状态仍由该详情读取。
       (t, r) => (openBlock(), createBlock(_id_))
     );
   },

app/pages/bills/index.vue

@@ -32,6 +32,7 @@ var i = defineComponent({
           hash: e.hash,
         }),
       }),
+      // 保留空壳渲染以兼容旧入口，实际列表由路由重定向进入财务中心。
       (t, r) => (openBlock(), createElementBlock(`div`))
     );
   },