Initial import of HEROLL source and design documents

design/gameplay-validation/diagrams/reward-transaction.mmd

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+flowchart TD
+  click["点击即时增强"] --> eligible{"实例可用且未领取?"}
+  eligible -- 否 --> reject["保持原状态并提示"]
+  eligible -- 是 --> create["创建 transactionId 与 PENDING 事务"]
+  create --> persist["写入安全存档"]
+  persist --> apply["应用确定收益"]
+  apply --> commit["事务标记 COMMITTED"]
+  commit --> checkpoint["写完整结算安全点"]
+  checkpoint --> render["播放图标反馈与收益动画"]
+  recover["刷新/崩溃恢复"] --> lookup{"transactionId 状态"}
+  lookup -- COMMITTED --> renderOnly["只恢复表现，不再发奖"]
+  lookup -- PENDING --> apply
+  lookup -- 不存在 --> click