Remove xvfb-run dependency from rendering process

- Eliminated the use of xvfb-run for headless rendering in the RenderProcessor, simplifying the command execution for Blender.
- Updated the CheckRequiredTools function to remove the check for xvfb-run, reflecting the change in rendering requirements.

internal/runner/tasks/render.go

@@ -175,10 +175,7 @@ func (p *RenderProcessor) runBlender(ctx *Context, blenderBinary, blendFile, out
 		args = append(args, "-f", fmt.Sprintf("%d", ctx.Frame))
 	}
 
-	// Wrap with xvfb-run
-	xvfbArgs := []string{"-a", "-s", "-screen 0 800x600x24", blenderBinary}
-	xvfbArgs = append(xvfbArgs, args...)
-	cmd := exec.Command("xvfb-run", xvfbArgs...)
+	cmd := exec.Command(blenderBinary, args...)
 	cmd.Dir = ctx.WorkDir
 
 	// Set up environment with custom HOME directory