Feature Request: Native Feishu Interactive Card Support

Use case
Feishu (Lark) interactive cards are widely used in China for bot workflows — they support rich elements (headers, markdown, dividers, buttons with callback_data) and enable button-based user interactions without the user typing commands.

Current state
Currently, Hermes Gateway connects to Feishu and sends plain text messages fine, but does not support Feishu interactive cards (message_card with interactive elements). Sending cards requires raw API calls via urllib/curl with manually constructed card JSON — this is not integrated into the messaging platform abstraction.

Proposed solution
Add first-class Feishu interactive card support to the Hermes Gateway Feishu adapter:

1. Card template abstraction — similar to how other platforms abstract message types, add a type in the Feishu adapter that accepts a card schema and renders it as Feishu's + payload
2. Button callback handling — when a user clicks a card button, Feishu sends a callback event with . Map this back to Hermes's / routing so the agent can handle button clicks in conversation
3. Card element support — at minimum: header (with title + template_colors), markdown, dividers, buttons (with action_id/callback_data)
4. Example use case — a cron job monitoring system that sends a card with status buttons ("查看详情" / "忽略") and reacts based on user selection

Alternative considered
Building a dedicated Feishu MCP server — but native gateway support would be cleaner and consistent with how other platform features (Discord buttons, Telegram inline keyboards) are handled.

References

• Feishu card message API: https://open.feishu.cn/document/server-docs/im-v1/message-content-description/create_json
• Feishu interactive card docs: https://open.feishu.cn/document/uAjLw4CM/ukTMukTMukTM/reference/im-v1/message-card/create