Update pyproject to use standard practices

*   **Observation:** The `pyproject.toml` uses a non-standard `[dependency-groups]` table for development dependencies.
*   **Recommendation:** Migrate from `[dependency-groups]` to the PEP 621 standard `[project.optional-dependencies]`. This improves compatibility with a wider range of modern Python packaging tools, including `pip`.
*   **Why:** While `uv` understands `[dependency-groups]`, the standard practice is to use `[project.optional-dependencies]`. This ensures that a user can install development dependencies with `pip install .[dev]` without needing `uv`.

Author: holtskinner

pyproject.toml

@@ -68,7 +68,7 @@ exclude = [
 vcs = "git"
 style = "pep440"
 
-[dependency-groups]
+[project.optional-dependencies]
 dev = [
     "datamodel-code-generator>=0.30.0",
     "mypy>=1.15.0",