Fix Dockerfile: add file package installation

- Add file package to runtime environment
- Fix build error where file command was not found

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Dockerfile

@@ -88,7 +88,7 @@ RUN echo "🔧 ===== 运行时环境准备 =====" && \
     echo "   - 用户: $(whoami)" && \
     echo "   - 系统信息: $(uname -a)" && \
     echo "📋 安装运行时工具..." && \
-    apk add --no-cache wget && \
+    apk add --no-cache wget file && \
     echo "✅ 运行时环境准备完成"
 
 # Copy the Pre-built binary from the previous stage with logging