Fix linting issues with ruff --fix

Applied automatic fixes for 315 out of 597 linting errors:
- Remove unused imports (F401)
- Fix f-string without placeholders (F541)
- Split multiple imports (E401)
- Remove redundant import aliases

Remaining 272 errors are mostly style issues:
- 164 E701: Multiple statements on one line (colon)
- 70 E402: Module import not at top of file
- 13 F841: Unused variables
- Various other style warnings

Code functionality unchanged - all fixes are cosmetic improvements.

mcp_auth/clerk_config.py

@@ -36,7 +36,7 @@ def create_clerk_oauth_config() -> OAuthConfig:
         scopes=["mcp:tools:read", "mcp:tools:write", "openid", "profile", "email"]
     )
     
-    logger.info(f"Created Clerk OAuth config with adapter endpoints")
+    logger.info("Created Clerk OAuth config with adapter endpoints")
     logger.info(f"Clerk domain: {clerk_domain}")
     logger.debug(f"Authorization endpoint: {config.authorization_endpoint}")
     logger.debug(f"Token endpoint: {config.token_endpoint}")