feat: implement core backend for team owner management with SQLite, auto-add APIs, and a frontend owner list component.

backend/internal/api/team_process.go

@@ -292,7 +292,8 @@ func processSingleTeam(idx int, req TeamProcessRequest) TeamProcessResult {
 		Errors:       make([]string, 0),
 	}
 
-	logPrefix := fmt.Sprintf("[Team %d]", idx+1)
+	// 固定宽度的 Team 编号 (支持到 Team 99)
+	logPrefix := fmt.Sprintf("[Team %2d]", idx+1)
 	logger.Info(fmt.Sprintf("%s 开始处理 | 母号: %s", logPrefix, owner.Email), owner.Email, "team")
 
 	// 标记 owner 为处理中
@@ -385,12 +386,23 @@ func processSingleTeam(idx int, req TeamProcessRequest) TeamProcessResult {
 				// 重试时使用新邮箱
 				currentEmail = mail.GenerateEmail()
 				currentPassword = register.GeneratePassword()
-				logger.Warning(fmt.Sprintf("%s [成员 %d] 重试，新邮箱: %s", logPrefix, memberIdx+1, currentEmail), currentEmail, "team")
+				logger.Warning(fmt.Sprintf("%s [成员 %d] 重试, 新邮箱: %s", logPrefix, memberIdx+1, currentEmail), currentEmail, "team")
 			}
 
 			// 发送邀请
 			if err := inviter.SendInvites([]string{currentEmail}); err != nil {
+				errStr := err.Error()
 				logger.Error(fmt.Sprintf("%s [成员 %d] 邀请失败: %v", logPrefix, memberIdx+1, err), currentEmail, "team")
+
+				// 检测 Team 已达邀请上限
+				if strings.Contains(errStr, "maximum number of seats") {
+					logger.Warning(fmt.Sprintf("%s Team 邀请已满，标记母号为已使用", logPrefix), owner.Email, "team")
+					if database.Instance != nil {
+						database.Instance.MarkOwnerAsUsed(owner.Email)
+					}
+					// 跳出重试，该成员不再处理
+					return false
+				}
 				continue
 			}
 
@@ -538,7 +550,7 @@ func processSingleTeam(idx int, req TeamProcessRequest) TeamProcessResult {
 					result.Errors = append(result.Errors, fmt.Sprintf("Owner S2A: %v", err))
 				} else {
 					result.AddedToS2A++
-					logger.Success(fmt.Sprintf("%s [母号] ✓ 入库成功", logPrefix), owner.Email, "team")
+					logger.Success(fmt.Sprintf("%s [母号  ] ✓ 入库成功", logPrefix), owner.Email, "team")
 				}
 			}
 		}