feat: 仪表盘+催办在休息日跳过填报检查

- 新增 is_working_day() 工具函数，自动跳过周末 + 可配置法定假日
- 仪表盘填报进度新增 is_rest_day 字段，休息日显示灰「休」印章
- 催办调度改用 is_working_day() 替代原始 weekday 检查
- 系统设置新增「法定节假日」配置卡片，支局长可管理假日日期

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/views/desktop/Settings.vue

@@ -15,6 +15,8 @@ const announceLoading = ref(false)
 const dailyCheckLoading = ref(false)
 const notificationTime = ref('17:30')
 const notificationTimeLoading = ref(false)
+const holidays = ref('')
+const holidaysLoading = ref(false)
 
 const importLoading = ref(false)
 const importFile = ref<File | null>(null)
@@ -32,6 +34,9 @@ onMounted(async () => {
     if (res.data?.notification_time) {
       notificationTime.value = res.data.notification_time
     }
+    if (res.data?.holidays) {
+      holidays.value = res.data.holidays
+    }
   } catch (_) {}
 })
 
@@ -75,6 +80,16 @@ async function handleSaveNotificationTime() {
   } finally { notificationTimeLoading.value = false }
 }
 
+async function handleSaveHolidays() {
+  holidaysLoading.value = true
+  try {
+    await api.put('/system-config/holidays', { value: holidays.value })
+    ElMessage.success('节假日已更新')
+  } catch (e: any) {
+    ElMessage.error(e.response?.data?.detail || '保存失败')
+  } finally { holidaysLoading.value = false }
+}
+
 function handleImportFile(e: Event) {
   const target = e.target as HTMLInputElement
   if (target.files?.[0]) importFile.value = target.files[0]
@@ -205,6 +220,37 @@ async function handleImportPreview() {
       </div>
     </el-card>
 
+    <!-- Holidays -->
+    <el-card class="setting-card">
+      <template #header>
+        <div class="card-header-title">
+          <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" style="margin-right:6px; color: var(--gold)">
+            <rect x="3" y="4" width="18" height="18" rx="2" ry="2"></rect>
+            <line x1="16" y1="2" x2="16" y2="6"></line>
+            <line x1="8" y1="2" x2="8" y2="6"></line>
+            <line x1="3" y1="10" x2="21" y2="10"></line>
+          </svg>
+          法定节假日
+        </div>
+      </template>
+      <div class="setting-row">
+        <div class="setting-col" style="flex:1">
+          <label class="setting-label">节假日日期（逗号分隔，格式 YYYY-MM-DD）</label>
+          <div style="display:flex;gap:8px;align-items:flex-start">
+            <el-input
+              v-model="holidays"
+              type="textarea"
+              :rows="2"
+              placeholder="如: 2026-10-01, 2026-10-02, 2026-10-05"
+              style="flex:1"
+            />
+            <el-button type="primary" :loading="holidaysLoading" @click="handleSaveHolidays" size="small">保存</el-button>
+          </div>
+          <p style="color:var(--warm-gray);font-size:12px;margin-top:6px">配置后，仪表盘和催办提醒在这些日期将跳过填报检查（周末自动跳过无需配置）</p>
+        </div>
+      </div>
+    </el-card>
+
     <!-- Import -->
     <el-card class="setting-card">
       <template #header>