[Model] Add LongCat-Flash (#3833)

### What this PR does / why we need it?
Add LongCat-Flash support.
### Does this PR introduce _any_ user-facing change?
N/A
### How was this patch tested?
CI passed

- vLLM version: v0.13.0
- vLLM main:
ad32e3e19c

---------

Signed-off-by: chuyuelin <923822139@qq.com>
Co-authored-by: chuyuelin <chuyuelin1@huawei.com>

vllm_ascend/quantization/w4a16.py

@@ -199,6 +199,7 @@ class AscendW4A16FusedMoEMethod:
         num_expert_group: Optional[int] = None,
         custom_routing_function: Optional[Callable] = None,
         scoring_func: str = "softmax",
+        routed_scaling_factor: float = 1.0,
         e_score_correction_bias: Optional[torch.Tensor] = None,
         is_prefill: bool = True,
         enable_force_load_balance: bool = True,