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"

scripts/download-tiktoken.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+# ==============================================================================
+# tiktoken 編碼下載腳本
+# 用於 Docker build 階段預下載 tiktoken 編碼
+# ==============================================================================
+
+set -e
+
+echo "📦 下載 tiktoken 編碼..."
+
+python3 <<'PYTHON'
+try:
+    import tiktoken
+    for enc_name in ['cl100k_base', 'p50k_base', 'r50k_base']:
+        try:
+            enc = tiktoken.get_encoding(enc_name)
+            print(f'✅ tiktoken {enc_name} 已下載')
+        except Exception as e:
+            print(f'⚠️ tiktoken {enc_name} 下載失敗: {e}')
+except ImportError:
+    print('⚠️ tiktoken 未安裝，跳過')
+PYTHON
+
+echo "✅ tiktoken 編碼下載完成"

scripts/generate-mineru-config.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+# ==============================================================================
+# MinerU 配置檔產生腳本
+# 用於 Docker build 階段產生 mineru.json
+# ==============================================================================
+
+set -e
+
+ARCH=$(uname -m)
+MODELS_DIR="${MINERU_MODELS_DIR:-/opt/convertx/models/mineru}"
+
+mkdir -p /opt/convertx
+
+if [ "$ARCH" = "aarch64" ]; then
+    echo '{"models-dir":{"pipeline":"","vlm":""},"model-source":"local","note":"ARM64 - MinerU not supported"}' > /opt/convertx/mineru.json
+    cp /opt/convertx/mineru.json /root/mineru.json
+    echo "⚠️ ARM64：產生空的 mineru.json"
+    exit 0
+fi
+
+python3 <<'PYTHON'
+import json
+import os
+
+mineru_models_dir = os.environ.get('MINERU_MODELS_DIR', '/opt/convertx/models/mineru')
+
+config = {
+    'models-dir': {
+        'pipeline': f'{mineru_models_dir}/PDF-Extract-Kit-1.0',
+        'vlm': ''
+    },
+    'model-source': 'local',
+    'latex-delimiter-config': {
+        'display': {'left': '@@', 'right': '@@'},
+        'inline': {'left': '@', 'right': '@'}
+    }
+}
+
+os.makedirs('/opt/convertx', exist_ok=True)
+
+with open('/opt/convertx/mineru.json', 'w') as f:
+    json.dump(config, f, indent=2)
+
+with open('/root/mineru.json', 'w') as f:
+    json.dump(config, f, indent=2)
+
+print('✅ mineru.json 已產生')
+PYTHON
+
+echo "✅ MinerU 配置檔產生完成"