feat(permissions): add workspace.skills_import and workspace.skills_export permissions (#25921)

backend/open_webui/routers/users.py

@@ -179,6 +179,8 @@ class WorkspacePermissions(BaseModel):
     prompts_export: bool = False
     tools_import: bool = False
     tools_export: bool = False
+    skills_import: bool = False
+    skills_export: bool = False
 
 
 class SharingPermissions(BaseModel):