Allow editable install without .git with add fallback version in pyproject.toml (#16435)

python/pyproject.toml

@@ -172,6 +172,8 @@ exclude = [
 root = ".."
 version_file = "sglang/_version.py"
 git_describe_command = ["git", "describe", "--tags", "--long", "--match", "v*"]
+# Allow editable installs even when .git metadata is not available.
+fallback_version = "0.0.0.dev0"
 
 [tool.codespell]
 ignore-words-list = "ans, als, hel, boostrap, childs, te, vas, hsa, ment"