refactor(symbols): 重命名K线时长字段从period到bar

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yesterday 915218a43e8d7eb7b0d938151c6e0e1deba6f152

 src/main/java/com/xcong/excoin/modules/contract/parameter/dto/OrderListDto.java

@@ -24,4 +24,8 @@
    @ApiModelProperty(value = "每页数量", example = "10")
    private int pageSize;

    @NotNull
    @ApiModelProperty(value = "币种", example = "BTC/USDT")
    private String symbol;

}