feat(frontend): 回测页加K线周期选择器(日线/5m/15m)

New.vue 加K线周期radio(日线d/5m/15m,默认d),backtest.ts CtaSubmit加interval字段。
提交body传interval(后端已支持5m/15m回测)。默认d向后兼容。

frontend/src/api/backtest.ts

@@ -7,6 +7,7 @@ export interface CtaSubmit {
   start: string
   end: string
   benchmark?: string
+  interval?: string
 }
 
 export interface TaskStatus {

frontend/src/views/backtest/New.vue

@@ -17,6 +17,7 @@ const form = reactive({
   start: '2024-01-01',
   end: '2024-06-30',
   benchmark: 'hs300',
+  interval: 'd',
 })
 const paramValues = reactive<Record<string, string>>({})
 
@@ -67,6 +68,7 @@ async function onSubmit(): Promise<void> {
       start: form.start,
       end: form.end,
       benchmark: form.benchmark,
+      interval: form.interval,
     })
     ElMessage.success('回测已提交')
     router.push(`/backtest/progress/${tid}`)
@@ -119,6 +121,14 @@ async function onSubmit(): Promise<void> {
         <el-form-item label="结束日期">
           <el-date-picker v-model="form.end" type="date" value-format="YYYY-MM-DD" style="width: 220px" />
         </el-form-item>
+        <el-form-item label="K 线周期">
+          <el-radio-group v-model="form.interval">
+            <el-radio-button value="d">日线</el-radio-button>
+            <el-radio-button value="5m">5 分钟</el-radio-button>
+            <el-radio-button value="15m">15 分钟</el-radio-button>
+          </el-radio-group>
+          <span class="muted form-hint">日内周期仅支持有分钟数据的标的</span>
+        </el-form-item>
       </el-form>
     </el-card>