fix(billing): 优化对账接口查询性能 - #1332
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问题
GET /api/admin/v1/billing/reconciliation会针对每个账户分别聚合账本流水和未完成交易；其中未完成交易缺少按账户和时间排序的专用索引，数据量增长后会产生大量重复扫描。改动
(started_at, id)部分索引account_id INCLUDE (reserve)部分索引CREATE INDEX CONCURRENTLY降低上线建索引对计费写入的阻塞验证
migrate完成up → down → up验证go test ./...go vet ./...sqlc diff说明
sqlcschema -check在未改动的main（d658310d）上已因图片迁移生成漂移失败，本 PR 未混入对应的无关 schema/model 生成重排。