refactor: rename auth.py to gitea_auth.py and ignore env files

mcp_server.py

@@ -17,14 +17,14 @@ import os
 import sys
 import subprocess
 
-# Ensure the project root is on the path so auth.py can be imported.
+# Ensure the project root is on the path so gitea_auth.py can be imported.
 PROJECT_ROOT = os.path.dirname(os.path.abspath(__file__))
 if PROJECT_ROOT not in sys.path:
     sys.path.insert(0, PROJECT_ROOT)
 
 from mcp.server.fastmcp import FastMCP  # noqa: E402
 
-from auth import (  # noqa: E402
+from gitea_auth import (  # noqa: E402
     REMOTES,
     get_credentials,
     get_auth_header,