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Stands up the controller with all 13 rank-battle URL routes wired via explicit absolute [HttpPost] attributes (multi-prefix family — can't ride [Route(\"[controller]\")]). Real DoMatching / AiStart logic arrives in later tasks; finish + telemetry + force-finish are returnable stubs as of this task. DTOs cover the request + response shapes per the spec. Note the camelCase wire keys on AiBattlePlayerInfo (sleeveId, emblemId, ...) — the AI battle subsystem uses camelCase, not the project-default snake_case, per AIBattleStartTask.Parse's literal Keys.Contains lookups. DoMatchingResponseDto.NodeServerUrl is non-nullable + always-emit (with [JsonIgnore(Never)]) — matches Phase 2's TK2 fix because the client's DoMatchingBase parser calls .ToString() without a Keys.Contains guard. 13 routing smoke tests confirm each URL resolves to the controller. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>