Added disable_reasoning toggle that works via: 1. API parameter: reasoning_effort: 'none' (DeepSeek, Qwen) 2. System prompt instruction: 'Respond directly with ONLY the JSON. Do NOT include any reasoning, thinking, or chain-of-thought' (works for ALL models universally) Backend: model column, schema, preview+executor payload Frontend: checkbox in LLM settings, i18n en+ru