Add Whisper offline loading for air-gapped servers.

Pre-download via HF mirror scripts so inner-network deploys avoid Hub Network is unreachable errors.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/download_all_models.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+# 一次性下载 Whisper + ChatTTS 全部模型（内网服务器部署必跑）
+set -euo pipefail
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+cd "${ROOT}"
+
+echo "========== 下载 Whisper (small) =========="
+bash scripts/download_whisper_models.sh small
+
+echo ""
+echo "========== 下载 ChatTTS =========="
+bash scripts/download_chattts_models.sh
+
+echo ""
+echo "[OK] 全部模型下载完成，请: pm2 restart trading_studio"