fix(docker): replace python3 -c with heredoc scripts to fix IndentationError

scripts/download-mineru-models.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+# ==============================================================================
+# MinerU 模型下載腳本
+# 用於 Docker build 階段下載 PDF-Extract-Kit-1.0
+# ==============================================================================
+
+set -e
+
+ARCH=$(uname -m)
+MODELS_DIR="${MINERU_MODELS_DIR:-/opt/convertx/models/mineru}"
+
+if [ "$ARCH" = "aarch64" ]; then
+    echo "⚠️ ARM64：跳過 MinerU 模型下載"
+    exit 0
+fi
+
+echo "📦 下載 MinerU PDF-Extract-Kit-1.0 到 ${MODELS_DIR}..."
+
+python3 <<'PYTHON'
+from huggingface_hub import snapshot_download
+import os
+
+models_dir = os.environ.get('MINERU_MODELS_DIR', '/opt/convertx/models/mineru')
+print(f'下載 PDF-Extract-Kit-1.0 到 {models_dir}...')
+
+snapshot_download(
+    repo_id='opendatalab/PDF-Extract-Kit-1.0',
+    local_dir=f'{models_dir}/PDF-Extract-Kit-1.0',
+    local_dir_use_symlinks=False,
+    resume_download=True
+)
+
+print('✅ PDF-Extract-Kit-1.0 下載完成')
+PYTHON
+
+echo "✅ MinerU 模型下載完成"