Implements three join-path state machine endpoints: - /guild/join: FREE (instant), APPROVAL (pending row + idempotent re-apply), ONLY_INVITE (pending invite required); CommitJoin consumes invites + cancels join requests; MaxMemberNum cap enforced. - /guild/cancel_join_request: cancels all pending requests for caller (no request_id on wire per GuildJoinRequestCancelTask decompile, composite PK kept). - /guild/join_request_list: leader/subleader sees pending applicants with viewer profile (name/emblem/degree/request_time unix secs). IGuildService.CancelJoinRequestAsync signature changed from (viewerId, guildId) to (viewerId) since the client sends no guildId. GuildJoinRequestEntry enriched record added to GuildServiceTypes. Re-apply after cancel resets existing row in-place to avoid composite-PK conflict. 11 integration tests, all green. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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