feat(backend/jobs): add agent_id parameter

backend/internal/handlers/jobs.go

@@ -230,6 +230,7 @@ type JobMetricsOut struct {
 // @Tags jobs
 // @Produce json
 // @Param period query string false "Time period (e.g. 1h, 24h, 7d)" default(24h)
+// @Param agent_id query string false "Filter by agent ID"
 // @Success 200 {object} JobMetricsOut
 // @Failure 400 {object} map[string]string
 // @Security Bearer
@@ -242,8 +243,9 @@ func (h *JobsHandlers) GetJobMetrics(c *gin.Context) {
 		return
 	}
 
+	agentID := c.Query("agent_id")
 	since := time.Now().Add(-period)
-	metrics, err := h.jobRepo.GetJobMetrics(c.Request.Context(), since)
+	metrics, err := h.jobRepo.GetJobMetrics(c.Request.Context(), since, agentID)
 	if err != nil {
 		c.Error(err)
 		return