refactor(selection): 统一信号与股票处理逻辑，重构相关数据结构与接口，更新前端展示以支持股票信息

zhixing-web/src/features/selection/api/selection.types.ts

@@ -43,6 +43,15 @@ export interface SelectionSignal {
   details: Record<string, number | string | null>
 }
 
+export interface SelectionStockResult {
+  ts_code: string
+  name: string
+  target_trade_date: string
+  strategy: SelectionStrategy
+  close: number
+  signals: SelectionSignal[]
+}
+
 export interface SelectionFailure {
   ts_code: string
   name: string
@@ -69,7 +78,7 @@ export interface SelectionResults {
   finished_at: string | null
   page: number
   page_size: number
-  signals_total: number
+  stocks_total: number
   failures: SelectionFailure[]
-  signals: SelectionSignal[]
+  stocks: SelectionStockResult[]
 }