Fix Glm4MoeIntegrationTest: offload_folder + remove 4bit quantization
Replace BitsAndBytesConfig(load_in_4bit) with offload_folder pattern
(matching glm4v_moe fix in f24b457b): tempfile.TemporaryDirectory,
70% max_memory cap for multi-GPU headroom, dtype="auto".
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>