feat: 调优创建支持 SFT 自动合并权重

FineTuneTask 类型新增 auto_merge 字段，SFT 训练表单新增自动合并权重开关并在创建/启动时随参提交，回归脚本补充 auto_merge 与模型对话框断言。

frontend/scripts/regression-fine-tune-create-ui.mjs

@@ -4,6 +4,7 @@ import { fileURLToPath } from 'node:url'
 
 const root = resolve(fileURLToPath(new URL('..', import.meta.url)))
 const source = readFileSync(resolve(root, 'src/views/fine-tune/FineTuneCreateView.vue'), 'utf8')
+const modelDialogSource = readFileSync(resolve(root, 'src/components/ModelSelectDialog.vue'), 'utf8')
 
 function assert(condition, message) {
   if (!condition) {
@@ -18,10 +19,16 @@ assert(source.includes('gpu-usage-bar'), 'GPU cards should visualize usage with
 assert(source.includes('is-busy'), 'GPU cards should have a distinct busy state for usage over 80%')
 assert(source.includes('gpu.gpu_percent > 80'), 'GPU busy state should be driven by usage over 80%')
 assert(source.includes('modelDialogVisible'), 'Model selection should open a dialog instead of a plain select')
-assert(!source.includes('width="78vw"'), 'Model dialog should not use the previous oversized 78vw width')
-assert(source.includes('width="860px"'), 'Model dialog should use a compact enterprise modal width')
-assert(source.includes('model-series-list'), 'Model dialog should include a model series list column')
-assert(source.includes('model-version-list'), 'Model dialog should include a snapshot/version list column')
-assert(source.includes('confirmModelSelection'), 'Model dialog should confirm the selected model before updating the form')
+assert(!modelDialogSource.includes('width="78vw"'), 'Model dialog should not use the previous oversized 78vw width')
+assert(modelDialogSource.includes('width="860px"'), 'Model dialog should use a compact enterprise modal width')
+assert(modelDialogSource.includes('model-series-list'), 'Model dialog should include a model series list column')
+assert(modelDialogSource.includes('model-version-list'), 'Model dialog should include a snapshot/version list column')
+assert(modelDialogSource.includes('handleConfirm'), 'Model dialog should confirm the selected model before updating the form')
+assert(source.includes("auto_merge: false"), 'Auto merge should default to disabled')
+assert(source.includes('v-if="form.train_type === \'SFT\'"'), 'Merge model settings should only be visible for SFT')
+assert(source.includes('content-position="left">合并模型'), 'SFT form should include a merge model section below data configuration')
+assert(source.includes('v-model="form.auto_merge"'), 'Merge model section should provide an auto merge selector')
+assert(source.includes('label="自动合并权重并保存"'), 'Auto merge selector should use a clear visible label')
+assert((source.match(/auto_merge: form\.train_type === 'SFT' && form\.auto_merge/g) || []).length === 2, 'Auto merge should be sent for SFT when creating and starting the task')
 
 console.log('fine-tune create UI regression checks passed')