1af56b4ec4
Bug 1 ("pay to enter again after restart"):
arena_info[0].is_join shipped from the static ArenaSeasonConfig seed,
so /load/index and /mypage/index always emitted false regardless of
viewer state. The client uses is_join to choose between the "Pay to
enter" and "Resume run" dialogs (Wizard/ChallengeEntry.cs:165 + the
ArenaEntryBase._isJoinFunc pivot). Without a per-viewer override every
cold start after a partial run looked like "no run" and the player got
charged again.
LoadController + MyPageController now compute is_join from
ViewerArenaTwoPickRuns presence. MyPageController grew an
IArenaTwoPickRunRepository dep (LoadController already had _db).
Bug 2: /arena/get_challenge_info 404. Stubbed via a new
ArenaController + DTO pair. Returns the season seed's begin/end_time
+ name where available; placeholder zeros for win history. All 6 keys
required by ChallangeHistoryInfoTask.Parse are present (unconditional
JsonData lookups).
Routing smoke added for /arena/get_challenge_info.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>