feat: v0.8.x 功能更新与数据维护优化

- MAC地址格式统一为小写 xxxx-xxxx-xxxx，支持三种格式输入
- 更换设备MAC时自动清理OLT新发现列表中的冲突ONU记录
- 设备编辑新增场所类型字段（手动输入），区域改为下拉快速填充
- 编辑/更换设备时自动移除new_devices中同MAC的待入库记录
- 新增登录过期自动跳转（401拦截 + 过期提示）
- 新增关于页面（/about），支持Markdown渲染，管理员可在设置中编辑内容
- 新增device_status_history每日自动清理任务（保留30天）
- 更新README.md和about.md

frontend/src/views/DeviceList.vue

@@ -361,7 +361,7 @@
       </div>
       <el-form :model="replaceForm" label-width="80px">
         <el-form-item label="新 MAC 地址" required>
-          <el-input v-model="replaceForm.new_mac" placeholder="例：AABBCCDDEEFF 或 AA:BB:CC:DD:EE:FF" clearable />
+          <el-input v-model="replaceForm.new_mac" placeholder="例：AABB-CCDD-EEFF" clearable @input="formatMacInput" />
         </el-form-item>
         <el-form-item label="更换原因">
           <el-input v-model="replaceForm.reason" type="textarea" :rows="2" placeholder="可选，填写更换原因" />
@@ -385,10 +385,23 @@
     <!-- 编辑对话框 -->
     <el-dialog v-model="editVisible" title="编辑设备信息" width="460px" destroy-on-close>
       <el-form :model="editForm" label-width="70px">
-        <el-form-item label="区域"><el-input v-model="editForm.region" /></el-form-item>
+        <el-form-item label="区域">
+          <el-select
+            v-model="editForm.region"
+            filterable
+            allow-create
+            placeholder="选择或输入区域"
+            style="width: 100%"
+          >
+            <el-option v-for="r in regionOptions" :key="r" :label="r" :value="r" />
+          </el-select>
+        </el-form-item>
         <el-form-item label="学校"><el-input v-model="editForm.school_name" /></el-form-item>
         <el-form-item label="楼宇"><el-input v-model="editForm.building" /></el-form-item>
         <el-form-item label="房间号"><el-input v-model="editForm.room_number" /></el-form-item>
+        <el-form-item label="场所类型">
+          <el-input v-model="editForm.place_type" placeholder="如：宿舍、教室、办公室…" />
+        </el-form-item>
         <el-form-item label="备注"><el-input v-model="editForm.notes" type="textarea" :rows="2" /></el-form-item>
       </el-form>
       <template #footer>
@@ -526,7 +539,8 @@ let cooldownTimer = null
 const clearing = ref(false)
 
 const editVisible = ref(false)
-const editForm = ref({ region: '', school_name: '', building: '', room_number: '', notes: '' })
+const editForm = ref({ region: '', school_name: '', building: '', room_number: '', place_type: '', notes: '' })
+const regionOptions = ref([])
 const editSaving = ref(false)
 
 const replaceVisible = ref(false)
@@ -602,8 +616,10 @@ const openEditFromCard = (device) => {
     school_name: device.school_name || '',
     building: device.building || '',
     room_number: device.room_number || '',
+    place_type: device.place_type || '',
     notes: device.notes || '',
   }
+  loadRegionOptions()
   editVisible.value = true
 }
 
@@ -727,6 +743,18 @@ const openReplace = async () => {
   replaceVisible.value = true
 }
 
+// 输入时自动格式化为 xxxx-xxxx-xxxx（小写）
+const formatMacInput = () => {
+  const raw = replaceForm.value.new_mac.toLowerCase().replace(/[^0-9a-f]/g, '')
+  if (raw.length <= 4) {
+    replaceForm.value.new_mac = raw
+  } else if (raw.length <= 8) {
+    replaceForm.value.new_mac = raw.slice(0, 4) + '-' + raw.slice(4)
+  } else {
+    replaceForm.value.new_mac = raw.slice(0, 4) + '-' + raw.slice(4, 8) + '-' + raw.slice(8, 12)
+  }
+}
+
 const doReplace = async () => {
   if (!replaceForm.value.new_mac.trim()) {
     ElMessage.warning('请输入新 MAC 地址')
@@ -753,12 +781,21 @@ const openEdit = () => {
     school_name: selectedDevice.value.school_name || '',
     building: selectedDevice.value.building || '',
     room_number: selectedDevice.value.room_number || '',
+    place_type: selectedDevice.value.place_type || '',
     notes: selectedDevice.value.notes || '',
   }
+  loadRegionOptions()
   detailVisible.value = false
   editVisible.value = true
 }
 
+const loadRegionOptions = async () => {
+  try {
+    const { data } = await deviceApi.getRegions()
+    regionOptions.value = data
+  } catch {}
+}
+
 const saveEdit = async () => {
   editSaving.value = true
   try {