feat: 新增预算费控模型与报销审批流引擎

后端新增预算费控服务和报销单审批流模块，引入申请人费用画像
算法，优化知识库 RAG 运行时和同步逻辑，完善报销单工作流常
量和明细同步，更新差旅报销规则电子表格，前端新增预算分析
组件和数字员工模型，完善审批对话框和洞察面板交互，优化侧
边栏和顶栏样式，补充单元测试。

web/src/components/shared/ReturnReasonDialog.vue

@@ -22,14 +22,15 @@
           <label
             v-for="option in options"
             :key="option.code"
-            :class="['return-reason-option', { active: selectedCodes.includes(option.code) }]"
+            :class="['return-reason-option', { active: isOptionActive(option.code) }]"
           >
             <input
-              v-model="selectedCodes"
-              type="checkbox"
+              :type="application ? 'radio' : 'checkbox'"
+              :name="application ? 'application-return-reason' : undefined"
+              :checked="isOptionActive(option.code)"
               :value="option.code"
               :disabled="busy"
-              @change="handleOptionChange"
+              @change="handleOptionChange(option)"
             />
             <i :class="option.icon"></i>
             <strong>{{ option.label }}</strong>
@@ -99,6 +100,12 @@ const APPLICATION_RETURN_REASON_OPTIONS = [
     label: '前置材料需补充',
     icon: 'mdi mdi-file-document-plus-outline',
     defaultReason: '请补充会议通知、客户邀约、项目安排或其他能支撑申请必要性的材料。'
+  },
+  {
+    code: 'application_other',
+    label: '其他',
+    icon: 'mdi mdi-pencil-box-outline',
+    defaultReason: ''
   }
 ]
 
@@ -117,12 +124,18 @@ const props = defineProps({
 const emit = defineEmits(['close', 'confirm'])
 
 const selectedCodes = ref([])
+const selectedApplicationCode = ref('')
 const reasonText = ref('')
 const touched = ref(false)
 const selectionTouched = ref(false)
 const lastAutoReason = ref('')
 
 const options = computed(() => (props.application ? APPLICATION_RETURN_REASON_OPTIONS : CLAIM_RETURN_REASON_OPTIONS))
+const selectedReasonCodes = computed(() => (
+  props.application
+    ? (selectedApplicationCode.value ? [selectedApplicationCode.value] : [])
+    : selectedCodes.value
+))
 const dialogBadge = computed(() => (props.application ? '退回申请' : '退回单据'))
 const optionsTitle = computed(() => (props.application ? '退单选项' : '默认风险点'))
 const optionsAriaLabel = computed(() => (props.application ? '申请退单选项' : '默认退回风险点'))
@@ -133,10 +146,10 @@ const reasonPlaceholder = computed(() => (
 ))
 const trimmedReason = computed(() => reasonText.value.trim())
 const selectionError = computed(() => {
-  if (!props.application || !selectionTouched.value || selectedCodes.value.length > 0) {
+  if (!props.application || !selectionTouched.value || selectedReasonCodes.value.length > 0) {
     return ''
   }
-  return '请选择至少一个退单选项，便于后续看板统计。'
+  return '请选择一个退单选项，便于后续看板统计。'
 })
 const reasonError = computed(() => {
   if (!touched.value || trimmedReason.value.length >= 6) {
@@ -159,6 +172,7 @@ watch(
   (open) => {
     if (open) {
       selectedCodes.value = []
+      selectedApplicationCode.value = ''
       reasonText.value = ''
       touched.value = false
       selectionTouched.value = false
@@ -167,25 +181,35 @@ watch(
   }
 )
 
-watch(selectedCodes, () => {
-  if (!props.application) {
-    return
-  }
-
-  const defaultReason = selectedCodes.value
-    .map((code) => options.value.find((option) => option.code === code)?.defaultReason || '')
-    .filter(Boolean)
-    .join('\n')
-
+function syncApplicationDefaultReason(option) {
+  const defaultReason = String(option?.defaultReason || '').trim()
   const canAutoFill = !touched.value || !reasonText.value.trim() || reasonText.value === lastAutoReason.value
   if (canAutoFill) {
     reasonText.value = defaultReason
   }
   lastAutoReason.value = defaultReason
-})
+}
 
-function handleOptionChange() {
+function isOptionActive(code) {
+  return props.application ? selectedApplicationCode.value === code : selectedCodes.value.includes(code)
+}
+
+function handleOptionChange(option) {
   selectionTouched.value = true
+
+  if (props.application) {
+    selectedApplicationCode.value = option.code
+    syncApplicationDefaultReason(option)
+    return
+  }
+
+  const selected = new Set(selectedCodes.value)
+  if (selected.has(option.code)) {
+    selected.delete(option.code)
+  } else {
+    selected.add(option.code)
+  }
+  selectedCodes.value = Array.from(selected)
 }
 
 function handleClose() {
@@ -197,13 +221,13 @@ function handleClose() {
 function handleConfirm() {
   touched.value = true
   selectionTouched.value = true
-  if ((props.application && selectedCodes.value.length === 0) || trimmedReason.value.length < 6 || props.busy) {
+  if ((props.application && selectedReasonCodes.value.length === 0) || trimmedReason.value.length < 6 || props.busy) {
     return
   }
 
   emit('confirm', {
     reason: trimmedReason.value,
-    reason_codes: [...selectedCodes.value]
+    reason_codes: [...selectedReasonCodes.value]
   })
 }
 </script>