Chore: set tool_required to opena-like llm calls (#13025)

src/paperless_ai/client.py

@@ -130,6 +130,7 @@ class AIClient:
             user_msg=user_msg,
             chat_history=[],
             allow_parallel_tool_calls=True,
+            tool_required=True,
         )
         tool_calls = self.llm.get_tool_calls_from_response(
             result,