feat(recycle-bin): 实现回收站功能

- 新增回收站相关 API 接口
- 添加回收站页面组件和路由
- 实现笔记和分类的软删除功能
- 支持回收站内容的获取、恢复和永久删除操作
- 优化用户界面，增加回收站入口和相关提示

biji-qianduan/src/components/TrashPage.vue

@@ -0,0 +1,104 @@
+<template>
+  <el-container>
+    <el-header>
+      <h1>回收站</h1>
+      <el-button type="danger" @click="handleCleanTrash" :disabled="trashItems.length === 0">清空回收站</el-button>
+      <el-button @click="goBack">返回首页</el-button>
+    </el-header>
+    <el-main>
+      <el-table :data="trashItems" style="width: 100%">
+        <el-table-column prop="title" label="名称"></el-table-column>
+        <el-table-column prop="type" label="类型">
+          <template #default="scope">
+            <el-tag :type="scope.row.type === 'group' ? 'success' : 'primary'">
+              {{ scope.row.type === 'group' ? '分类' : '笔记' }}
+            </el-tag>
+          </template>
+        </el-table-column>
+        <el-table-column prop="deletedAt" label="删除时间"></el-table-column>
+        <el-table-column label="操作">
+          <template #default="scope">
+            <el-button size="small" type="primary" @click="handleRestore(scope.row)">恢复</el-button>
+            <el-button size="small" type="danger" @click="handleDeletePermanently(scope.row)">永久删除</el-button>
+          </template>
+        </el-table-column>
+      </el-table>
+      <el-empty v-if="trashItems.length === 0" description="回收站是空的"></el-empty>
+    </el-main>
+  </el-container>
+</template>
+
+<script setup>
+import { ref, onMounted } from 'vue';
+import { useRouter } from 'vue-router';
+import { ElMessage, ElMessageBox } from 'element-plus';
+import { getTrash, restoreTrashItem, permanentlyDeleteItem, cleanTrash } from '@/api/CommonApi.js';
+
+const router = useRouter();
+const trashItems = ref([]);
+
+const fetchTrashItems = async () => {
+  try {
+    const response = await getTrash();
+    trashItems.value = response.data || [];
+  } catch (error) {
+    ElMessage.error('获取回收站内容失败');
+  }
+};
+
+const handleRestore = async (item) => {
+  try {
+    await restoreTrashItem(item.id);
+    ElMessage.success('恢复成功');
+    fetchTrashItems();
+  } catch (error) {
+    ElMessage.error('恢复失败');
+  }
+};
+
+const handleDeletePermanently = async (item) => {
+  await ElMessageBox.confirm('确定要永久删除此项目吗？此操作不可恢复。', '警告', {
+    confirmButtonText: '确定',
+    cancelButtonText: '取消',
+    type: 'warning',
+  });
+  try {
+    await permanentlyDeleteItem(item.id);
+    ElMessage.success('已永久删除');
+    fetchTrashItems();
+  } catch (error) {
+    ElMessage.error('删除失败');
+  }
+};
+
+const handleCleanTrash = async () => {
+  await ElMessageBox.confirm('确定要清空回收站吗？此操作不可恢复。', '警告', {
+    confirmButtonText: '确定',
+    cancelButtonText: '取消',
+    type: 'warning',
+  });
+  try {
+    await cleanTrash();
+    ElMessage.success('回收站已清空');
+    fetchTrashItems();
+  } catch (error) {
+    ElMessage.error('清空失败');
+  }
+};
+
+const goBack = () => {
+  router.push('/home');
+};
+
+onMounted(() => {
+  fetchTrashItems();
+});
+</script>
+
+<style scoped>
+.el-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+</style>