[bugfix] A2 Environment Pooling for Memcache Compatibility (#5601)

### What this PR does / why we need it?
When running memcache in the A2 environment, the logic for registering
memory needs to be added. Additionally, there is a link establishment
conflict between memcache and HCCS during initialization in A2, so the
link should be established in advance.

### Does this PR introduce _any_ user-facing change?

### How was this patch tested?

- vLLM version: v0.13.0
- vLLM main:
7157596103

---------

Signed-off-by: fangjianwei <f30058701@china.huawei.com>
Co-authored-by: fangjianwei <f30058701@china.huawei.com>

vllm_ascend/distributed/kvpool/pool_worker.py

@@ -87,7 +87,7 @@ class KVPoolWorker:
             self.put_step = 1
 
         self.metadata = KeyMetadata(
-            model_config.model.split('/')[-1],
+            model_config.model.rstrip('/').split('/')[-1],
             self.head_or_tp_rank,
             self.pcp_rank,
             self.dcp_rank,