Merge pull request #7282 from feeeei/feat/affiliate-offline-withdrawal

feat(affiliate): 提取记录支持登记线下提现

backend/migrations/240_affiliate_ledger_operation_id.sql

@@ -0,0 +1,10 @@
+-- 管理员登记线下提现的幂等标识：同一 operation_id 只对应一条流水，
+-- 重试同一次登记时据此返回首次登记的结果，不重复扣减。
+ALTER TABLE user_affiliate_ledger
+    ADD COLUMN IF NOT EXISTS operation_id VARCHAR(64);
+
+COMMENT ON COLUMN user_affiliate_ledger.operation_id IS '管理员登记线下提现的幂等标识（由 Idempotency-Key 派生的 SHA-256 十六进制串）；其他流水为 NULL';
+
+CREATE UNIQUE INDEX IF NOT EXISTS idx_user_affiliate_ledger_operation_id
+    ON user_affiliate_ledger (operation_id)
+    WHERE operation_id IS NOT NULL;