chore: consolidate to single ruff config in root pyproject.toml

- Merge web ruff settings (select E/F/I/UP, line-length 100) into root config
- Remove [tool.ruff] section from web/pyproject.toml
- Remove "web" from root ruff exclude list
- Simplify pre-commit hook to one command: ruff check .
- Update CI to use: uv run ruff check . (from repo root)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/pyproject.toml

@@ -36,14 +36,6 @@ dev-dependencies = [
     "ruff>=0.3.0",
 ]
 
-[tool.ruff]
-line-length = 100
-target-version = "py311"
-
-[tool.ruff.lint]
-select = ["E", "F", "I", "UP"]
-ignore = ["E501"]
-
 [tool.pytest.ini_options]
 asyncio_mode = "auto"
 testpaths = ["tests"]