feat: 在文件管理页面中为文件名称添加超链接，并优化有效期显示逻辑

src/views/billManagement/fileManagement.vue

@@ -6,11 +6,15 @@
         <el-table :data="list" border max-height="600" @selection-change="handleSelectionChange">
         <el-table :data="list" border max-height="600" @selection-change="handleSelectionChange">
           <el-table-column type="index" label="序号" width="50" align="center" fixed></el-table-column>
           <el-table-column type="index" label="序号" width="50" align="center" fixed></el-table-column>
           <el-table-column prop="type_name" label="文件类型" min-width="170" :show-overflow-tooltip="true" align="center"></el-table-column>
           <el-table-column prop="type_name" label="文件类型" min-width="170" :show-overflow-tooltip="true" align="center"></el-table-column>
-          <el-table-column prop="file_name" label="文件名称" min-width="170" :show-overflow-tooltip="true" align="center"></el-table-column>
+          <el-table-column prop="file_name" label="文件名称" min-width="170" :show-overflow-tooltip="true" align="center">
+            <template slot-scope="scope">
+              <a :href="scope.row.file_url" target="_blank" style="color: #409EFF; text-decoration: none;">{{ scope.row.file_name }}</a>
+            </template>
+          </el-table-column>
           <el-table-column prop="description" label="文件说明" min-width="200" :show-overflow-tooltip="true" align="center"></el-table-column>
           <el-table-column prop="description" label="文件说明" min-width="200" :show-overflow-tooltip="true" align="center"></el-table-column>
           <el-table-column prop="validity_start" label="有效期" width="200" :show-overflow-tooltip="true" align="center">
           <el-table-column prop="validity_start" label="有效期" width="200" :show-overflow-tooltip="true" align="center">
             <template slot-scope="scope">
             <template slot-scope="scope">
-              {{ scope.row.validity_start }} ~ {{ scope.row.validity_end }}
+              {{ scope.row.validity_start > 0 && scope.row.validity_end > 0 ? scope.row.validity_start + ' ~ ' + scope.row.validity_end : '' }}
             </template>
             </template>
           </el-table-column>
           </el-table-column>
           <el-table-column prop="create_name" label="上传人" width="200" :show-overflow-tooltip="true" align="center"></el-table-column>
           <el-table-column prop="create_name" label="上传人" width="200" :show-overflow-tooltip="true" align="center"></el-table-column>