feat: capture in-game battle damage statistics & add battle_report API endpoints

internal/gameserver/handlers_battle.go

@@ -113,6 +113,23 @@ func init() {
 		rsp.EndStatus = req.EndStatus
 		rsp.BattleId = req.BattleId
 		rsp.StageId = req.StageId
+
+		if req.Stt != nil {
+			statusStr := "WIN"
+			switch req.EndStatus {
+			case goproto.BattleEndStatus_BATTLE_END_LOSE:
+				statusStr = "LOSE"
+			case goproto.BattleEndStatus_BATTLE_END_QUIT:
+				statusStr = "QUIT"
+			}
+			report := common.BattleReportFromStatistics(req.Stt, req.BattleId, req.StageId, statusStr)
+			if err := common.SaveBattleReport(report); err != nil {
+				Log(fmt.Sprintf("[DAMAGE_ANALYST] Failed to save battle report: %v", err))
+			} else {
+				Log(fmt.Sprintf("[DAMAGE_ANALYST] Battle report captured: BattleID=%d Dmg=%.1f Cycles=%d Turns=%d Status=%s",
+					req.BattleId, report.TeamTotalDamage, report.RoundCnt, report.TotalBattleTurns, statusStr))
+			}
+		}
 		return nil
 	})