[ModelOpt] Fix broken Qwen3-235B-A22B-Instruct-2507-NVFP4 launch (#18189)

Signed-off-by: vincentzed <207368749+vincentzed@users.noreply.github.com>

python/sglang/srt/models/qwen3_moe.py

@@ -890,6 +890,14 @@ class Qwen3MoeModel(Qwen2MoeModel):
 class Qwen3MoeForCausalLM(nn.Module):
     fall_back_to_pt_during_load = False
 
+    # Mapping from fused module names to their component weight names.
+    # Required for quantization configs (e.g., ModelOpt FP4) to correctly identify
+    # which layers should be skipped based on the exclude_modules/ignore list.
+    packed_modules_mapping = {
+        "qkv_proj": ["q_proj", "k_proj", "v_proj"],
+        "gate_up_proj": ["gate_proj", "up_proj"],
+    }
+
     def __init__(
         self,
         config: Qwen3MoeConfig,