Convert Feishu/Lark cloud documents to Markdown for AI analysis and processing.

• Supports four document types: docx (with embedded images), sheets, bitable, and wiki pages, all exported as Markdown
• Includes CLI commands for export, OAuth setup, and credential management; also offers Python API for direct content retrieval
• Can output to files or stdout, with automatic image downloading and optional Markdown table formatting
• Token caching and auto-refresh eliminate re-authorization; supports both Feishu and Lark (overseas) instances