chore: migrate to PEP 735 dependency-groups

replaces deprecated [tool.uv] dev-dependencies with standardized [dependency-groups] dev

- removes deprecation warning
- follows PEP 735 standard for dependency groups
- alphabetized dev dependencies for consistency

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[e-mail]>

pyproject.toml

···
 asyncio_mode = "auto"
 asyncio_default_fixture_loop_scope = "function"
 
-[tool.uv]
-dev-dependencies = [
+[dependency-groups]
+dev = [
+    "pytest-asyncio",
     "pytest-sugar",
- "pytest-asyncio",
- "ruff",
- "ty",
+    "ruff",
+    "ty",
 ]
-
 
 [tool.hatch.metadata]
 allow-direct-references = true