Previously every user-identity send/reply attached clawType=edition.ClawType()
unconditionally, so the IM server rendered an AI-sent badge ("通过AI发送" on the
open edition) under every message — surprising users by branding all their sends.
Make it opt-in: by default no clawType is attached (no badge). Passing --ai-tag
on 'chat message send' / 'chat message reply' attaches edition.ClawType() so the
badge shows (open=openClaw -> 通过AI发送, wukong overlay -> 悟空AI发送). Bot and
webhook sends remain untouched.
Follow-up to #475 (which fixed the hardcoded wukong leak, #474).
修雨
1a7ba01e36