feat: 合约API返回合约账户余额 + 手续费减半

- Contract.php get_coin(): 新增查询num_lh字段, 返回balance_contract
- site.php: contract_fee从0.018改为0.009(减半)
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li
2026-03-30 15:14:49 +08:00
commit 9e0c2a3870
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