feat: Introduce API for owner account import, validation, account ID management, and ban checks.

backend/internal/api/owner_ban_check.go

@@ -134,8 +134,8 @@ func runScheduledBanCheck() {
 
 	logger.Info(fmt.Sprintf("定期封禁检查: 发现 %d 个需要检查的母号", len(owners)), "", "ban-check")
 
-	// 执行检查
-	go runBanCheckTask(owners, 2)
+	// 执行检查（并发数 20）
+	go runBanCheckTask(owners, 20)
 }
 
 // HandleBanCheckSettings 获取/设置封禁检查配置
@@ -231,14 +231,11 @@ func HandleManualBanCheck(w http.ResponseWriter, r *http.Request) {
 	}
 	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
 		// 允许空 body
-		req.Concurrency = 2
+		req.Concurrency = 20
 	}
 
 	if req.Concurrency <= 0 {
-		req.Concurrency = 2
-	}
-	if req.Concurrency > 5 {
-		req.Concurrency = 5
+		req.Concurrency = 20
 	}
 
 	var owners []database.TeamOwner