feat: improve quick bookkeeping and asset inclusion

Add commemorative assets, session undo, paired repayment, month/day markers and filters. Compact account cards, move transfer entry, persist backup metadata, and update Chinese documentation.

apps/api/prisma/migrations/20261004154000_quick_repayment_month/migration.sql

@@ -0,0 +1 @@
+ALTER TABLE `Position` ADD COLUMN `lastRepaymentMonth` CHAR(7) NULL COMMENT '最后手动标记已完成还款的业务月份，UTC+8 YYYY-MM；空表示未标记';

apps/api/prisma/migrations/20261004161000_quick_booked_date/migration.sql

@@ -0,0 +1 @@
+ALTER TABLE `Position` ADD COLUMN `lastBookedDate` CHAR(10) NULL COMMENT '最后手动标记已完成记账的业务日期，UTC+8 YYYY-MM-DD；空表示未标记';