fix: add missing f-string prefixes in warning and assert messages (#22067)

Co-authored-by: yuj <yuj@ztjzsoft.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

python/sglang/srt/mem_cache/memory_pool_host.py

@@ -1201,7 +1201,7 @@ class MambaPoolHost(HostKVCache):
             "page_first",
             "page_first_direct",
             "layer_first",
-        ], "Unsupported layout: {layout}"
+        ], f"Unsupported layout: {layout}"
 
         self.layout = layout
         self.pin_memory = pin_memory

python/sglang/srt/models/phi4mm.py

@@ -529,7 +529,7 @@ class Phi4MMForCausalLM(nn.Module):
                 param = params_dict.get(name)
                 if param is None:
                     if "lora" not in name:
-                        logger.warning("Warning: {name} not found in model parameters")
+                        logger.warning(f"Warning: {name} not found in model parameters")
                     continue
                 weight_loader = getattr(param, "weight_loader", default_weight_loader)
                 weight_loader(param, loaded_weight)