refactor: unify kubernetes_ table prefix, merge CI/CD models, LLM session support

- Rename container_clusters → kubernetes_clusters, container_topology_layouts → kubernetes_topology_layouts
- LLM: add session_id to chat history for multi-turn conversation support
- CI/CD: add pipeline_id, deploy_type, artifact_url, k8s_cluster_id to AppRelease
- Cleanup: remove deprecated playbook handler, simplify automation models
- Database: optimize auto-migrate model list
- Frontend: AIOps assistant improvements, api.ts updates

backend/internal/api/handlers/automation_cron.go

@@ -304,7 +304,10 @@ func (h *AutomationHandler) ExecuteCronJob(c *gin.Context) {
 
 	// Resolve the content to execute. For type=script, load the linked Script.
 	content := job.Content
-	scriptType := "shell"
+	scriptType := job.Type // shell | python | command | script
+	if scriptType == "command" {
+		scriptType = "shell" // one-liner commands run via bash
+	}
 	if job.Type == "script" && job.ScriptID != nil {
 		var script models.Script
 		if err := h.db.First(&script, *job.ScriptID).Error; err == nil {