enhance: feat: Lark integration closes #3571

[Wendong-Fan]

Description

Bug Fixes

• Fix lark_get_message_resource_key parsing wrong API response path (data.body → data.items[0].body)

Improvements

• Simplify lark_list_chats response: return only chat_id and name
• Simplify lark_get_chat_messages response:
  • Convert timestamps to readable format (2026-01-13 07:15:10 UTC)
  • Parse message content JSON and extract text field
  • Render system message templates
  • Mark image/file messages with [Image: key]
• Update example with multiple demo scenarios

Response Format Changes for Better Agent Understanding

lark_list_chats:

# Before: {'code': 0, 'data': {'items': [{'chat_id': '...', 'name': '...', 'avatar': '...', ...}]}}
# After:  {'chats': [{'chat_id': '...', 'name': '...'}], 'has_more': False}

lark_get_chat_messages:

  # Before: {'code': 0, 'data': {'items': [{'body': {'content': '{"text":"hi"}'}, 'create_time': '1768262110094', ...}]}}
  # After:  {'messages': [{'message_id': '...', 'msg_type': 'text', 'text': 'hi', 'time': '2026-01-13 07:15:10 UTC', ...}]}

Checklist

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• I have linked this PR to an issue using the Development section on the right sidebar or by adding Fixes #issue-number in the PR description (required)
• I have checked if any dependencies need to be added or updated in pyproject.toml and uv lock
• I have updated the tests accordingly (required for a bug fix or a new feature)
• I have updated the documentation if needed:
• I have added examples if this is a new feature

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