docs: 添加项目文档和图表文件

添加游戏设计文档、技术架构文档、数值经济文档等内容新增Mermaid图表文件描述系统架构和流程包含README说明文档结构和阅读顺序
2026-04-28 19:19:20 +08:00
commit 2e1b58bada
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+sequenceDiagram
+  participant C as Client
+  participant API as Save API
+  participant DB as Database
+  C->>API: PUT /saves/{slotId} (save, If-Match)
+  API->>API: 校验Schema/引用/数值
+  API->>DB: 写入(事务)
+  DB-->>API: ok
+  API-->>C: 200 (new etag)