chengcheng
e3dfe8162b
fix(billing): 视频时长按实际秒数线性计费
将五秒基础价按 duration / 5 比例结算，保留 provider 返回的小数时长，避免六秒视频被按两个完整单位收费。
影响：所有使用 5s 视频基础价的模型，quantity 与 durationUnitCount 允许小数。新增迁移同步现存规则的旧 ceil 公式元数据。
验证：go vet ./...；pnpm lint；pnpm test；pnpm build；./tests/ci/migrations-test.sh
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