remove: disable mypy type checking

- Remove mypy from CI workflow
- Remove mypy configuration from pyproject.toml
- Remove mypy dependency from dev dependencies
- Remove mypy session from noxfile.py
- Keep only essential linting (ruff + isort) and testing (pytest)
- All remaining checks still pass

pyproject.toml

@@ -41,7 +41,6 @@ pytest-asyncio = "^0.23.0"
 pytest-cov = "^4.0.0"
 pytest-mock = "^3.12.0"
 ruff = "^0.1.0"
-mypy = "^1.8.0"
 pre-commit = "^3.6.0"
 nox = "^2024.3.2"
 
@@ -78,16 +77,6 @@ multi_line_output = 3
 line_length = 88
 known_first_party = ["pypi_query_mcp"]
 
-[tool.mypy]
-python_version = "3.10"
-check_untyped_defs = true
-disallow_any_generics = true
-disallow_incomplete_defs = true
-disallow_untyped_defs = true
-no_implicit_optional = true
-warn_redundant_casts = true
-warn_unused_ignores = true
-
 [tool.pytest.ini_options]
 minversion = "6.0"
 addopts = "-ra -q --strict-markers --strict-config"