[Feat][SP] Suport SP for VL MoE models (#7044)

### What this PR does / why we need it?

2nd PR for https://github.com/vllm-project/vllm-ascend/issues/5712,
extend SP to VL MoE models.


### Does this PR introduce _any_ user-facing change?
remove `sp_threshold` in additional config and reuse `sp_min_token_num`
from vLLM.


### How was this patch tested?
- Model: Qwen3-VL-30B-A3B, 
- TP4 DP2
- 100 reqs
- max concurrency 1

| Seq length | Mean TTFT (ms) main | Mean TTFT (ms) this PR |
|------------|---------------------|------------------------|
| 4k         | 429.40               | 323.3                  |
| 16k        | 1297.01              | 911.74                |

- vLLM version: v0.16.0
- vLLM main:
4034c3d32e

---------

Signed-off-by: realliujiaxu <realliujiaxu@163.com>

vllm_ascend/ascend_config.py

@@ -159,6 +159,12 @@ class AscendConfig:
             and get_ascend_device_type() != AscendDeviceType.A5
         )
 
+        self.enable_sp_by_pass = (
+            vllm_config.model_config is not None
+            and not vllm_config.model_config.enforce_eager
+            and vllm_config.compilation_config.pass_config.enable_sp
+        )
+
     @staticmethod
     def _get_compile_ranges(compilation_config):
         return compilation_config.compile_ranges_endpoints or []
@@ -195,14 +201,6 @@ class AscendConfig:
                     "{new_compile_ranges_split_points} for matmul and allreduce fusion"
                 )
 
-            from vllm_ascend.utils import is_moe_model
-
-            if vllm_config.compilation_config.pass_config.enable_sp and not is_moe_model(vllm_config):
-                from vllm_ascend.compilation.passes.sequence_parallelism import get_sp_threshold
-
-                sp_threshold = get_sp_threshold(vllm_config)
-                new_compile_ranges_split_points.append(sp_threshold)
-                logger.debug(f"add {sp_threshold} to compile_ranges_split_points for sequence parallelism")
             if len(new_compile_ranges_split_points) > len(self._get_compile_ranges(vllm_config.compilation_config)):
                 new_compile_ranges_split_points = sorted(new_compile_ranges_split_points)
                 self._set_compile_ranges(vllm_config.compilation_config, new_compile_ranges_split_points)