Refactor runner and installation scripts for improved functionality

- Removed the `--disable-hiprt` flag from the runner command, simplifying the rendering options for users.
- Updated the `jiggablend-runner` script and README to reflect the removal of the HIPRT control flag, enhancing clarity in usage instructions.
- Enhanced the installation script to provide clearer examples for running the jiggablend manager and runner, improving user experience during setup.
- Implemented a more robust GPU backend detection mechanism, allowing for better compatibility with various hardware configurations.

internal/manager/renderer.go

@@ -3,6 +3,7 @@ package api
 import (
 	"fmt"
 	"html/template"
+	"log"
 	"net/http"
 	"strings"
 	"time"
@@ -92,13 +93,17 @@ func newUIRenderer() (*uiRenderer, error) {
 func (r *uiRenderer) render(w http.ResponseWriter, data pageData) {
 	w.Header().Set("Content-Type", "text/html; charset=utf-8")
 	if err := r.templates.ExecuteTemplate(w, "base", data); err != nil {
+		log.Printf("Template render error: %v", err)
 		http.Error(w, "template render error", http.StatusInternalServerError)
+		return
 	}
 }
 
 func (r *uiRenderer) renderTemplate(w http.ResponseWriter, templateName string, data interface{}) {
 	w.Header().Set("Content-Type", "text/html; charset=utf-8")
 	if err := r.templates.ExecuteTemplate(w, templateName, data); err != nil {
+		log.Printf("Template render error for %s: %v", templateName, err)
 		http.Error(w, "template render error", http.StatusInternalServerError)
+		return
 	}
 }