修复账号禁用及队列场次状态规则

问题与需求：后台禁用员工后旧会话仍可继续访问；实时队列跨天误读昨日场次；项目暂停后需禁止取号但允许叫号。

修复思路：账号权限变更时撤销会话并同步前端登录态；实时查询统一按项目时区当天场次过滤；拆分取号与叫号的状态校验，并补充前后端及 PostgreSQL 回归测试。

server/internal/httpapi/queue_session.go

@@ -0,0 +1,42 @@
+package httpapi
+
+import (
+	"fmt"
+	"time"
+
+	"calllinesystem/server/internal/model"
+
+	"gorm.io/gorm"
+)
+
+func (s *Server) businessDateFor(project model.Project) (time.Time, error) {
+	location, err := time.LoadLocation(project.Timezone)
+	if err != nil {
+		return time.Time{}, fmt.Errorf("invalid project timezone: %w", err)
+	}
+	localNow := s.now().In(location)
+	return time.Date(localNow.Year(), localNow.Month(), localNow.Day(), 0, 0, 0, 0, location), nil
+}
+
+func (s *Server) currentQueueSession(db *gorm.DB, project model.Project) (model.QueueSession, error) {
+	businessDate, err := s.businessDateFor(project)
+	if err != nil {
+		return model.QueueSession{}, err
+	}
+	var session model.QueueSession
+	err = db.Where(
+		"project_id = ? AND business_date = ? AND status IN ?",
+		project.ID,
+		businessDate,
+		[]string{"RUNNING", "PAUSED"},
+	).First(&session).Error
+	return session, err
+}
+
+func (s *Server) queueSessionIsCurrent(project model.Project, session model.QueueSession) (bool, error) {
+	businessDate, err := s.businessDateFor(project)
+	if err != nil {
+		return false, err
+	}
+	return session.BusinessDate.Format("2006-01-02") == businessDate.Format("2006-01-02"), nil
+}