fix: sin loops de tool-calls en el chat

llama3.2 3B con las builtin tools de Open WebUI (Native mode) entra
en bucle: 'hola' -> calculate_timestamp x3 y suelta JSON crudo (3/3).
- function_calling=legacy (DEFAULT_MODEL_PARAMS): prompt-injection,
  el modo pensado para modelos pequenos
- CHAT_RESPONSE_MAX_TOOL_CALL_ITERATIONS=1: cinta de seguridad

openwebui/docker-compose.yml

@@ -47,6 +47,8 @@ services:
       ENABLE_SIGNUP: "true"
       ENABLE_WEB_SEARCH: "false"
       ENABLE_DIRECT_CONNECTIONS: "false"
+      CHAT_RESPONSE_MAX_TOOL_CALL_ITERATIONS: "1"
+      DEFAULT_MODEL_PARAMS: '{"function_calling": "legacy"}'
     depends_on:
       ollama:
         condition: service_healthy

wordpress/docker-compose.yml

@@ -77,6 +77,8 @@ services:
       WEBUI_NAME: "d0a1"
       WEBUI_AUTH: "false"
       DEFAULT_LOCALE: "es"
+      CHAT_RESPONSE_MAX_TOOL_CALL_ITERATIONS: "1"
+      DEFAULT_MODEL_PARAMS: '{"function_calling": "legacy"}'
     depends_on:
       ollama:
         condition: service_healthy