Update code style: remove deprecated Ruff rules and switch to f-string formatting

Author: gitctrlx

examples/models.py

@@ -18,7 +18,7 @@
     base_url=os.environ.get("GATEWAY_URL"),  # defaults to https://llm.qntx.fun/v1
 )
 
-print("[gateway] %s\n" % client.base_url)
+print(f"[gateway] {client.base_url}\n")
 print("Available models:")
 
 for m in client.models.list():

pyproject.toml

@@ -68,8 +68,6 @@ select = [
     "RUF",  # ruff-specific
 ]
 ignore = [
-    "ANN101",  # missing self annotation
-    "ANN102",  # missing cls annotation
     "ANN401",  # dynamically typed expressions (Any)
 ]