v1.4.0 — Qwen3-Next-80B as Default Model

v1.4.0\n\n### Changed\n- Default model switched to qwen/qwen3-next-80b-a3b-instruct:free — MoE 80B/3B active, fastest inference, no thinking traces, excellent multilingual support\n- Updated config.example.json and README to reflect the new default