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2abca9fb23
Extract business logic from handleMsgMhfOperateGuildMember into GuildService.OperateMember, establishing the handler→service→repo layering pattern. The handler is now ~20 lines of protocol glue (type-assert, map action, call service, send ACK, notify). GuildService owns authorization checks, repo coordination, mail composition, and best-effort mail delivery. It accepts plain Go types (no mhfpacket or Session imports), making it fully testable with mock repos. Cross-channel notification stays in the handler since it requires Session. Adds 7 table-driven service-level tests covering accept/reject/kick, authorization, repo errors, mail errors, and unknown actions.