Fix import resolution for direct execution

src/text_formatter.py

@@ -2,8 +2,10 @@ from __future__ import annotations
 
 import html
 import re
-from typing import Optional
-from .config import settings
+try:
+    from .config import settings
+except (ImportError, ValueError):
+    from config import settings
 
 
 def split_message_chunks(text: str, limit: int = 4000) -> list[str]: