fix(billing): reject rate_multiplier <= 0 on save; clamp negatives to 0 in compute
分组倍率和用户专属倍率在保存时没有校验,0 会触发计费层的 `<=0 → 1.0` 防御条款,结果订阅/余额分组按标准价扣费;完全是沉默地绕过了业务规则。 - 保存校验(admin_service):CreateGroup / UpdateGroup / BatchSetGroupRateMultipliers / UpdateUser.SyncUserGroupRates 全部要求 > 0 - 计算层(billing_service):三处 `<=0 → 1.0` 改为 `<0 → 0`;负数按 0 结算, 避免配置异常被静默按 1x 收费 - 前端:分组倍率 / 用户专属倍率输入 min 统一到 0.001 - 删除未使用的 IsFreeSubscription 方法 测试:新增 billing_service_rate_multiplier_test.go 端到端验证;更新原有锁定 旧 `<=0 → 1.0` 行为的测试。
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@@ -166,7 +166,7 @@
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<input
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type="number"
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step="0.001"
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min="0"
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min="0.001"
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autocomplete="off"
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:value="entry.rate_multiplier"
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class="hide-spinner w-20 rounded border border-gray-200 bg-white px-2 py-1 text-center text-sm font-medium transition-colors focus:border-primary-500 focus:outline-none focus:ring-1 focus:ring-primary-500/20 dark:border-dark-500 dark:bg-dark-700 dark:focus:border-primary-500"
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@@ -81,7 +81,7 @@
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<input
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type="number"
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step="0.001"
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min="0"
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min="0.001"
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:value="config.customRate ?? ''"
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@input="updateCustomRate(config.groupId, ($event.target as HTMLInputElement).value)"
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:placeholder="String(config.defaultRate)"
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@@ -139,7 +139,7 @@
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<input
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type="number"
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step="0.001"
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min="0"
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min="0.001"
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:value="config.customRate ?? ''"
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@input="updateCustomRate(config.groupId, ($event.target as HTMLInputElement).value)"
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:placeholder="String(config.defaultRate)"
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