chore: 合并 AGENTS 配置为单文件 AGENTS.md，精简 reasonix.toml

- 删除 AGENTS/ 目录下 8 个拆分 .md 文件，统一为根目录 AGENTS.md
- 删除 .reasonix.toml，配置合并到 reasonix.toml
- reasonix.toml 精简为仅保留实际生效的 3 项配置
- KlineInterval 类型导出源从 kline.entity 改到 ../../types

data/db/entities/index.ts

@@ -9,4 +9,4 @@ export { CommonBaseEntity } from "./common.entity";
 export { Exchange } from "./exchange.entity";
 export { TradingPair } from "./trading-pair.entity";
 export { Kline } from "./kline.entity";
-export type { KlineInterval } from "./kline.entity";
+export type { KlineInterval } from "../../types";