job/job-cheng-xing

作者	SHA1 備註	提交日期
b	f79fb48740 fix: add GetOrder, fix ErrConflict code to match spec	1 月之前
b	6b4397d2e2 fix: gofmt, ErrConflict error code, ErrInvalidState as func	1 月之前
b	6a6e5442cd fix: remove unused CancelOrderRequest struct	1 月之前
b	c9c9456595 feat: add Order model, status constants, and AppError	1 月之前