refactor: 四端完成 Options API → script setup + vuex → pinia 迁移

- buyer(95) / seller(169) / im(53) / manager(280) 共 597 个组件全部从 Options API 转换为 <script setup>
- 四端 vuex 全部移除，状态管理统一迁移至 pinia 4（stores/ 目录）
- util.js 等基础设施去除 vm 首参依赖；全局属性（$Message/$filters 等）在 script 内改为具名导入
- 被外部 ref 访问的公共组件均已补齐 defineExpose（清单见各端 MIGRATION-VUE3.md）
- 各端 eslint 启用 vue/component-api-style 防止新代码回退 Options API
- 四端 yarn build 全部通过；迁移约定与注意事项已更新至各端 MIGRATION-VUE3.md

manager/src/views/finance/payment-method.vue

@@ -24,39 +24,39 @@
   </div>
 </template>
 
-<script>
+<script setup>
+import { onMounted, ref } from "vue";
 import * as API_Finance from "@/api/finance";
 import { downloadBlob } from "@/utils/downloadBlob";
 
-export default {
-  name: "finance-payment-method",
-  data() {
-    return { loading: false, dateRange: [], data: [] };
-  },
-  mounted() {
-    this.loadData();
-  },
-  methods: {
-    buildParams() {
-      const p = {};
-      if (this.dateRange?.length === 2) {
-        p.startDate = this.dateRange[0];
-        p.endDate = this.dateRange[1];
-      }
-      return p;
-    },
-    loadData() {
-      this.loading = true;
-      API_Finance.getPaymentMethodReport(this.buildParams()).then((res) => {
-        this.loading = false;
-        if (res.success) this.data = res.result || [];
-      });
-    },
-    handleExport() {
-      API_Finance.exportPaymentMethodReport(this.buildParams()).then((blob) => {
-        downloadBlob(blob, "支付方式汇总.xlsx");
-      });
-    },
-  },
-};
+defineOptions({ name: "finance-payment-method" });
+
+const loading = ref(false);
+const dateRange = ref([]);
+const data = ref([]);
+
+onMounted(() => {
+  loadData();
+});
+
+function buildParams() {
+  const p = {};
+  if (dateRange.value?.length === 2) {
+    p.startDate = dateRange.value[0];
+    p.endDate = dateRange.value[1];
+  }
+  return p;
+}
+function loadData() {
+  loading.value = true;
+  API_Finance.getPaymentMethodReport(buildParams()).then((res) => {
+    loading.value = false;
+    if (res.success) data.value = res.result || [];
+  });
+}
+function handleExport() {
+  API_Finance.exportPaymentMethodReport(buildParams()).then((blob) => {
+    downloadBlob(blob, "支付方式汇总.xlsx");
+  });
+}
 </script>