Feishu Invoice Approval

Scaffold, configure, validate, run, and maintain a Feishu/Lark invoice approval bot that uses Codex vision, validates buyer headers, auto-selects the closest expense category, drafts the approval reason, sends an interactive confirmation card, and submits only after the original uploader confirms. Use for building or troubleshooting Feishu invoice-to-approval workflows, approval form mappings, dry-run tests, card callbacks, and duplicate protection.