feat(gateway): support Feishu interactive card (msg_type=interactive) in send_message

[MaHaoHao-ch]

What does this PR do?

This PR adds support for Feishu interactive cards (msg_type=interactive) in the send_message pipeline. Previously, agents could only send plain text or markdown post messages to Feishu, which rendered structured data (like tables) poorly.

Related Issue

Fixes #37777

Type of Change

• New feature (non-breaking change that adds functionality)

Changes Made

• gateway/platforms/feishu.py: Added _is_feishu_card_json static method to detect Feishu interactive card JSON format
• gateway/platforms/feishu.py: Modified _build_outbound_payload to route card JSON as msg_type='interactive'
• Supports standard card structures: config+elements, header+elements, template type, i18n
• Enables agents to send structured Feishu cards with proper formatting, colors, and layout control

How to Test

1. Send a Feishu card JSON through the agent send_message interface
2. The card should be rendered with proper formatting instead of being treated as plain text

Checklist

Code

• My commit messages follow Conventional Commits
• My PR contains only changes related to this fix/feature
• Tested on: Windows 10

Documentation & Housekeeping

• N/A - Code comments explain the new functionality

[teknium1]

Thanks for the focused Feishu card-routing contribution. The feature is still needed on current main: plugins/platforms/feishu/adapter.py:4524-4534 only classifies outbound content as text or post.

Problems

• The PR edits gateway/platforms/feishu.py, but that adapter was relocated to plugins/platforms/feishu/adapter.py by 552adbe08; GitHub reports this PR as DIRTY, so the implementation needs a targeted transplant rather than a clean merge.
• The PR adds no regression coverage for generic card JSON sent through adapter.send(). Existing tests only verify internally generated approval/update cards use interactive (tests/gateway/test_feishu_approval_buttons.py:88-115).

Suggested changes

• Apply the classifier at current plugins/platforms/feishu/adapter.py:4524 and preserve the table-to-text branch.
• Add send-path tests for a valid card JSON becoming msg_type="interactive", plus non-card JSON/Markdown/table controls.

Automated hermes-sweeper review.