fix: enforce requireMention setting for Feishu group chats

[yan-labs]

Problem

The bridge_feishu_require_mention setting exists in the config UI and is loaded from the database, but it was never actually checked in the message handling pipeline. This means the bot responds to all messages in group chats, even when "Require @mention" is enabled.

The Discord adapter correctly implements this check, but the Feishu adapter was missing the equivalent logic.

Changes

src/lib/channels/feishu/inbound.ts

• Added isBotMentioned() helper that checks message.mentions array for the bot's open_id
• When config.requireMention is true and the message is from a group chat (oc_ prefix), skip messages where the bot is not @mentioned
• Strip the @bot mention placeholder (e.g. @_user_1) from message text so the LLM receives clean input

src/lib/channels/feishu/index.ts

• Fetch bot identity via getBotInfo() after gateway starts, storing botOpenId
• Pass botOpenId to parseInboundMessage() for mention detection

How it works

Feishu includes a mentions array in im.message.receive_v1 events:

{
  "message": {
    "mentions": [
      { "key": "@_user_1", "id": { "open_id": "ou_xxx" }, "name": "MyBot" }
    ]
  }
}

The fix checks this array against the bot's open_id (fetched at startup) when requireMention is enabled.

Test plan

• Enable "Require @mention" in Feishu settings
• Send a message in a group chat without @mentioning the bot → bot should not respond
• Send a message in a group chat with @mention → bot should respond, and the @bot placeholder should be stripped from the input
• Send a DM → bot should respond regardless of the setting
• Disable "Require @mention" → bot should respond to all group messages again

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