feat: implement team process API endpoints

backend/internal/api/team_process.go

@@ -593,9 +593,9 @@ func processSingleTeam(idx int, req TeamProcessRequest) (result TeamProcessResul
 		s2aSem <- struct{}{}
 		defer func() { <-s2aSem }()
 
-		// 解析代理
-		proxyToUse := database.Instance.ResolveProxy(req.Proxy)
-		proxyDisplay := "无代理"
+		// 从代理池获取随机代理（默认轮询使用代理池，无代理则直连）
+		proxyToUse, _ := database.Instance.GetRandomCodexProxy()
+		proxyDisplay := "直连"
 		if proxyToUse != "" {
 			proxyDisplay = getProxyDisplay(proxyToUse)
 		}