feat(bid/rfq): add usage tips and association feedback for client quote

1. 为甲方报价选择框添加上方使用说明弹窗
2. 关联甲方报价后显示关联状态标签
3. 关联成功后展示导入物料的提示信息

ruoyi-ui/src/views/bid/rfq/index.vue

@@ -85,11 +85,22 @@
         <el-row>
           <el-col :span="12">
             <el-form-item label="关联甲方报价">
-              <el-select v-model="form.clientQuoteId" placeholder="选择甲方报价（可选）" filterable clearable
-                style="width:100%" @change="onClientQuoteSelect" :disabled="viewOnly">
-                <el-option v-for="q in clientQuoteOptions" :key="q.quoteId"
-                  :label="q.quoteNo + ' - ' + q.clientName" :value="q.quoteId" />
-              </el-select>
+              <el-tooltip placement="top" effect="light" style="width:100%">
+                <div slot="content">
+                  <div style="max-width:300px;line-height:1.8">
+                    <strong style="color:#409EFF">💡 使用说明：</strong><br/>
+                    1. 从下拉框选择已存在的甲方报价单<br/>
+                    2. 系统将<strong>自动导入</strong>该报价单中的所有物料明细<br/>
+                    3. 物料名称、规格、数量、预期单价会自动填充<br/>
+                    4. 您可以在下方表格中继续编辑或添加物料
+                  </div>
+                </div>
+                <el-select v-model="form.clientQuoteId" placeholder="选择甲方报价（可选）" filterable clearable
+                  style="width:100%" @change="onClientQuoteSelect" :disabled="viewOnly">
+                  <el-option v-for="q in clientQuoteOptions" :key="q.quoteId"
+                    :label="q.quoteNo + ' - ' + q.clientName" :value="q.quoteId" />
+                </el-select>
+              </el-tooltip>
             </el-form-item>
           </el-col>
           <el-col :span="12">
@@ -99,7 +110,22 @@
           </el-col>
         </el-row>
 
-        <el-divider content-position="left">物料明细</el-divider>
+        <el-divider content-position="left">
+          物料明细
+          <el-tag v-if="form.clientQuoteId" type="success" size="mini" style="margin-left:8px">
+            <i class="el-icon-link"></i> 已关联甲方报价
+          </el-tag>
+        </el-divider>
+        <el-alert
+          v-if="form.clientQuoteId && form.items && form.items.length > 0"
+          type="success"
+          :closable="false"
+          style="margin-bottom:12px">
+          <template slot="title">
+            <i class="el-icon-info"></i>
+            物料已自动从甲方报价单导入，您可以修改数量、单价等信息，或点击下方"添加物料行"继续添加
+          </template>
+        </el-alert>
         <el-table :data="form.items || []" border size="small">
           <el-table-column label="物料名称" min-width="150">
             <template slot-scope="scope">