feat: remove path separator normalization for cross-platform compatibility

Removed the forced normalization of path separators to forward slashes in BaseModelService to maintain platform-specific separators. Updated test cases to use os.sep for constructing expected paths, ensuring tests work correctly across different operating systems while preserving native path representations.

py/services/base_model_service.py

@@ -716,8 +716,6 @@ class BaseModelService(ABC):
                 if normalized_file.startswith(normalized_root):
                     # Remove root and leading separator to get relative path
                     relative_path = normalized_file[len(normalized_root):].lstrip(os.sep)
-                    # Normalize separators so results are stable across platforms
-                    relative_path = relative_path.replace(os.sep, "/")
                     break
             
             if not relative_path:

tests/services/test_relative_path_search.py

@@ -1,3 +1,4 @@
+import os
 import pytest
 
 from py.services.base_model_service import BaseModelService
@@ -42,8 +43,8 @@ async def test_search_relative_paths_supports_multiple_tokens():
     matching = await service.search_relative_paths("flux detail")
 
     assert matching == [
-        "flux/detail-model.safetensors",
-        "detail/flux-trained.safetensors",
+        f"flux{os.sep}detail-model.safetensors",
+        f"detail{os.sep}flux-trained.safetensors",
     ]
 
 
@@ -60,4 +61,4 @@ async def test_search_relative_paths_excludes_tokens():
 
     matching = await service.search_relative_paths("flux -detail")
 
-    assert matching == ["flux/keep-me.safetensors"]
+    assert matching == [f"flux{os.sep}keep-me.safetensors"]