Fix: Disable denoising for apt-get Blender (no OpenImageDenoise)

Blender 4.3.2 installed via apt-get lacks OpenImageDenoise support.
Explicitly disable denoising to prevent render failures.

This fix adds:
- bpy.context.view_layer.cycles.use_denoising = False
- Informative log message

Quality impact: Minor noise at 64 samples, acceptable for LEGO previews.

code/cube3d/render/render_bricks_safe.py

@@ -352,6 +352,10 @@ try:
     scene.render.filepath = "{output_file}"
     scene.render.use_overwrite = True
 
+    # Disable denoising (HF Spaces apt-get Blender lacks OpenImageDenoise)
+    bpy.context.view_layer.cycles.use_denoising = False
+    print("ℹ️  Denoising disabled (apt-get Blender has no OpenImageDenoise support)")
+
     print("ℹ️  使用 CPU 渲染（samples=64，云平台优化配置）")
 
     # GPU 配置已禁用（HuggingFace Spaces 不支持图形 GPU）