fix(qwen3.5): restrict MoE weights to local PP layers (#32022)

Co-authored-by: chunjiang.hc <chunjiang.hc@alibaba-inc.com>
Co-authored-by: Yihao Wang <42559837+AgainstEntropy@users.noreply.github.com>

python/sglang/srt/models/qwen3_5.py

@@ -2288,9 +2288,9 @@ class Qwen3_5MoeForConditionalGeneration(Qwen3VLForConditionalGeneration):
 
         self._routed_experts_weights_of_layer = LazyValue(
             lambda: {
-                layer_id: layer.mlp.get_moe_weights()
-                for layer_id, layer in enumerate(self.model.layers)
-                if isinstance(layer.mlp, Qwen2MoeSparseMoeBlock)
+                layer_id: self.model.layers[layer_id].mlp.get_moe_weights()
+                for layer_id in range(self.model.start_layer, self.model.end_layer)
+                if isinstance(self.model.layers[layer_id].mlp, Qwen2MoeSparseMoeBlock)
             }
         )