refactor: 数据处理向导生成选项改为平铺布局

移除生成选项面板的高级设置折叠抽屉，温度、最大输出长度、JSON 模式等配置直接平铺展示，简化非结构化与任务设置步骤的嵌套结构，列表新建按钮文案精简。

frontend/src/views/data-process/create/StructuredOptionsPanel.vue

@@ -94,19 +94,7 @@ function updatePreprocessOptions(value: Array<string | number | boolean>) {
         :validation-message="validationAttempted ? generationValidationMessage : ''"
         @update:options="updateGenerationOptions"
       />
-      <div class="generation-option-row">
-        <div class="generation-option-copy">
-          <strong>语义丰富表达</strong>
-          <small>使用大模型将问答表述得更自然、柔和</small>
-        </div>
-        <el-switch
-          :model-value="options.semanticEnrichment"
-          inline-prompt
-          active-text="开"
-          inactive-text="关"
-          @update:model-value="updateField('semanticEnrichment', Boolean($event))"
-        />
-      </div>
+
       <div class="generation-option-row">
         <div class="generation-option-copy">
           <strong>每行生成数量</strong>
@@ -192,6 +180,7 @@ function updatePreprocessOptions(value: Array<string | number | boolean>) {
 
 .preprocess-option {
   display: flex;
+  gap: 10px;
   width: 100%;
   min-height: 64px;
   margin-right: 0;