yxk-20260520-党委会：新增议题序号字段

序号自动生成，明确生成逻辑（先选日期再选议题），20260520-1

src/views/bg/bgpartymatter/components/BgPartymatterBPMForm.vue

@@ -40,7 +40,12 @@
             </a-col>
             <a-col :span="12">
               <a-form-item label="序号" name="number">
-                <a-input v-model:value="mainForm.number" :disabled="mainDisabled" allow-clear />
+                <a-input v-model:value="mainForm.number" :disabled="mainDisabled" :readonly="true" />
+              </a-form-item>
+            </a-col>
+            <a-col :span="12">
+              <a-form-item label="议题序号" name="itemNumber">
+                <a-input-number v-model:value="mainForm.itemNumber" :disabled="mainDisabled" style="width: 100%" allow-clear />
               </a-form-item>
             </a-col>
             <a-col :span="12">
@@ -238,12 +243,14 @@
   const feedbackAttachmentRefreshKey = ref(0);
   const subApproveUser = ref('');
   const isEnd = ref(0);
+  const lastGeneratedNumber = ref('');
 
   const mainForm = reactive<Record<string, any>>({
     id: '',
     year: '',
     secretLevel: '',
     number: '',
+    itemNumber: undefined,
     matterTime: '',
     title: '',
     content: '',
@@ -320,6 +327,14 @@
     { immediate: true }
   );
 
+  // 根据会议时间和议题序号自动生成业务序号，例如：2026-05-20 + 2 => 20260520-2。
+  watch(
+    () => [mainForm.matterTime, mainForm.itemNumber],
+    () => {
+      syncGeneratedNumber();
+    }
+  );
+
   async function initFormData() {
     const dataId = props.formData?.dataId;
     if (!dataId) {
@@ -342,6 +357,48 @@
     });
   }
 
+  function syncGeneratedNumber() {
+    const generatedNumber = buildGeneratedNumber(mainForm.matterTime, mainForm.itemNumber);
+    if (generatedNumber) {
+      mainForm.number = generatedNumber;
+      lastGeneratedNumber.value = generatedNumber;
+      return;
+    }
+    if (lastGeneratedNumber.value && mainForm.number === lastGeneratedNumber.value) {
+      mainForm.number = '';
+      lastGeneratedNumber.value = '';
+    }
+  }
+
+  // 只在两个必要字段都填写后生成，避免用户未填完整时写入半截序号。
+  function buildGeneratedNumber(matterTime, itemNumber) {
+    const dateText = formatMatterTime(matterTime);
+    if (!dateText || itemNumber === undefined || itemNumber === null || itemNumber === '') {
+      return '';
+    }
+    return `${dateText}-${itemNumber}`;
+  }
+
+  // 兼容日期选择器返回的字符串、Date、dayjs/moment 对象。
+  function formatMatterTime(value) {
+    if (!value) {
+      return '';
+    }
+    if (typeof value === 'string') {
+      return value.slice(0, 10).replace(/-/g, '');
+    }
+    if (value instanceof Date) {
+      const year = value.getFullYear();
+      const month = String(value.getMonth() + 1).padStart(2, '0');
+      const day = String(value.getDate()).padStart(2, '0');
+      return `${year}${month}${day}`;
+    }
+    if (typeof value.format === 'function') {
+      return value.format('YYYYMMDD');
+    }
+    return '';
+  }
+
   async function loadFeedbackList() {
     const bpmProcessId = processInfo.value.processInstanceId;
     if (!mainForm.id || !bpmProcessId) {