fix(workspace): exclude gp-furo-theme static/ from root sdist

why: hatchling's root sdist walks the entire tree but only reads
the root .gitignore — the nested packages/gp-furo-theme/.gitignore
that excludes static/ is invisible. When uv sync creates furo.js
as a side effect of editable-installing gp-furo-theme, the root
sdist discovers it and crashes if the file is absent or mid-write.

what:
- Add [tool.hatch.build.targets.sdist] exclude for the Vite build
  artifact directory in the root pyproject.toml

Author: tony

pyproject.toml

@@ -88,6 +88,11 @@ build-backend = "hatchling.build"
 [tool.hatch.build.targets.wheel]
 packages = ["src/gp_sphinx_workspace"]
 
+[tool.hatch.build.targets.sdist]
+exclude = [
+  "packages/gp-furo-theme/src/gp_furo_theme/theme/gp-furo/static/",
+]
+
 [tool.mypy]
 strict = true
 python_version = "3.10"