feat: 支付手续费功能
- 支持提供商级别和渠道级别手续费率配置(FEE_RATE_PROVIDER_* / FEE_RATE_*) - 用户多付手续费,到账金额不变(充值 ¥100 + 1.6% = 实付 ¥101.60) - 前端显示手续费明细和实付金额 - 退款时按实付金额退款,余额扣减到账金额
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-- AlterTable
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ALTER TABLE "orders" ADD COLUMN "pay_amount" DECIMAL(10,2),
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ADD COLUMN "fee_rate" DECIMAL(5,2);
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