[Model]Improve Qwen3VLMoeForConditionalGeneration packed_modules_mapping (#27096)

Signed-off-by: Jee Jee Li <pandaleefree@gmail.com>

vllm/model_executor/models/qwen3_vl_moe.py

@@ -350,6 +350,14 @@ class Qwen3MoeLLMForCausalLM(Qwen3MoeForCausalLM):
     dummy_inputs=Qwen3VLDummyInputsBuilder,
 )
 class Qwen3VLMoeForConditionalGeneration(Qwen3VLForConditionalGeneration):
+    packed_modules_mapping = {
+        "qkv_proj": [
+            "q_proj",
+            "k_proj",
+            "v_proj",
+        ],
+    }
+
     def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
         super(Qwen3VLForConditionalGeneration, self).__init__()
         config: Qwen3VLMoeConfig = vllm_config.model_config.hf_config
@@ -376,6 +384,11 @@ class Qwen3VLMoeForConditionalGeneration(Qwen3VLForConditionalGeneration):
         self.language_model = Qwen3MoeLLMForCausalLM(
             vllm_config=vllm_config, prefix=maybe_prefix(prefix, "language_model")
         )
+        # Whether to include the gate_up_proj mapping is determined by
+        # the language model.
+        self.packed_modules_mapping = (
+            self.packed_modules_mapping | self.language_model.packed_modules_mapping
+        )
 
         self.make_empty_intermediate_tensors = (
             self.language_model.make_empty_intermediate_tensors