[Feature][Wan2.2] Speed up diffusion model startup by multi-thread weight loading (#1504)

Signed-off-by: samithuang <285365963@qq.com>
Signed-off-by: Samit <285365963@qq.com>

vllm_omni/diffusion/data.py

@@ -379,6 +379,10 @@ class OmniDiffusionConfig:
     # Compilation
     enforce_eager: bool = False
 
+    # Parallel weight loading (for faster diffusion model startup)
+    enable_multithread_weight_load: bool = True
+    num_weight_load_threads: int = 4
+
     # Enable sleep mode
     enable_sleep_mode: bool = False