fix: Resolve all type checking errors in cache_manager.py

- Add proper type annotation for Redis client (Any type)
- Configure ruff to ignore PLC0415 for cache_manager.py (local import for optional redis)
- Add type ignore comments for import-untyped and unreachable code
- Import redis in TYPE_CHECKING block for type hints

All checks now pass: ruff format, ruff check, and mypy

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

Co-Authored-By: Claude <noreply@anthropic.com)

Author: TexasCoding

pyproject.toml

@@ -86,6 +86,7 @@ ignore = [
 [tool.ruff.lint.per-file-ignores]
 "tests/*" = ["D", "S101", "ARG", "PLR2004"]
 "__init__.py" = ["F401", "D104"]
+"src/py_alpaca_api/cache/cache_manager.py" = ["PLC0415"]  # Allow local import for optional redis
 
 [tool.ruff.lint.isort]
 known-first-party = ["py_alpaca_api"]

src/py_alpaca_api/cache/cache_manager.py

@@ -123,7 +123,7 @@ def __init__(self, config: CacheConfig):
             config: Cache configuration
         """
         self.config = config
-        self._client = None
+        self._client: Any = None
 
     def _get_client(self):
         """Get or create Redis client."""
@@ -143,7 +143,7 @@ def _get_client(self):
                     decode_responses=True,
                 )
                 # Test connection
-                self._client.ping()  # type: ignore[attr-defined]
+                self._client.ping()
                 logger.info("Redis cache connected successfully")
             except Exception:
                 logger.exception("Failed to connect to Redis")