style: refactor codebase to adhere to PEP 8 formatting standards throughout all source files

src/strava_mcp_server/tools/__init__.py

@@ -3,6 +3,7 @@ MCP Tool definitions for the Strava MCP Server.
 
 Register all tools by calling register_tools(mcp, strava).
 """
+
 from mcp.server.fastmcp import FastMCP
 from strava_mcp_server.strava_client import StravaClient
 
@@ -15,6 +16,7 @@ from . import segment_efforts
 from . import gear
 from . import prompts
 
+
 def register_tools(mcp: FastMCP, strava: StravaClient) -> None:
     """Register all available tools and prompts."""
     athlete.register(mcp, strava)