standardize packaging, tooling, docs, CI, and licensing

openapi_first/app.py

@@ -46,8 +46,10 @@ _env_pattern = re.compile(r"\{(\w+)\}")
 
 def _resolve_env(value: str) -> str:
     """Replace {ENV_VAR} placeholders with values from os.environ."""
+
     def _replace(m: re.Match) -> str:
         return os.environ.get(m.group(1), m.group(0))
+
     return _env_pattern.sub(_replace, value)