feat: add clear-all button to Dashboard quick actions

web/frontend/src/views/Dashboard.vue

@@ -183,6 +183,18 @@
                 <span class="action-desc">处理Excel生成采购单</span>
               </div>
             </button>
+            <button class="action-btn action-btn-danger" @click="clearAll" :disabled="processing">
+              <div class="action-icon danger">
+                <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5">
+                  <polyline points="3,6 5,6 21,6"/>
+                  <path d="M19,6v14a2,2,0,0,1-2,2H7a2,2,0,0,1-2-2V6M8,6V4a2,2,0,0,1,2-2h4a2,2,0,0,1,2,2V6"/>
+                </svg>
+              </div>
+              <div class="action-info">
+                <span class="action-name">清除全部</span>
+                <span class="action-desc">删除所有文件和处理记录</span>
+              </div>
+            </button>
           </div>
         </div>
       </div>
@@ -192,7 +204,7 @@
 
 <script setup lang="ts">
 import { ref, computed, onMounted, nextTick, watch } from 'vue'
-import { ElMessage } from 'element-plus'
+import { ElMessage, ElMessageBox } from 'element-plus'
 import { Refresh, Document, Grid } from '@element-plus/icons-vue'
 import { useProcessingStore } from '../stores/processing'
 import api from '../api'
@@ -402,6 +414,33 @@ const runPipeline = () => doAction('/processing/pipeline')
 const runOcr = () => doAction('/processing/ocr-batch')
 const runExcel = () => doAction('/processing/excel')
 
+async function clearAll(): Promise<void> {
+  try {
+    await ElMessageBox.confirm(
+      '将删除 input、output、result 目录下所有文件，并清除全部处理记录。此操作不可撤销，是否继续？',
+      '清除全部数据',
+      { type: 'warning', confirmButtonText: '确认清除', cancelButtonText: '取消' }
+    )
+  } catch { return }
+
+  processing.value = true
+  try {
+    await Promise.all([
+      api.post('/files/clear/input'),
+      api.post('/files/clear/output'),
+      api.post('/files/clear/result'),
+      api.delete('/tasks'),
+      api.post('/files/relations/sync'),
+    ])
+    ElMessage.success('已清除所有文件和处理记录')
+    refreshStats()
+  } catch (err: any) {
+    ElMessage.error(err.response?.data?.detail || '清除失败')
+  } finally {
+    processing.value = false
+  }
+}
+
 // Auto-refresh stats when any task completes or fails
 watch(
   () => visibleTasks.value.map(t => t.status),
@@ -674,6 +713,16 @@ onMounted(() => {
   color: #525252;
 }
 
+.action-icon.danger {
+  background: rgba(239,68,68,0.08);
+  color: #ef4444;
+}
+
+.action-btn-danger:hover:not(:disabled) {
+  border-color: #fca5a5;
+  background: #fef2f2;
+}
+
 .action-info {
   display: flex;
   flex-direction: column;