新功能: 还原 v1/public/user/invite_sales 接口 + promo schema 修复迁移

- 还原 /v1/public/user/invite_sales 接口及 /invite/sales 别名（与 invite_records 并存）
  逻辑/handler/types 与 197fed7d 删除前版本完全一致，按 fefbd4f5 新 routes 结构注册
- 新增迁移 02155_promo_schema_fix: 幂等修复 subscribe_promo / order 列类型与索引偏差
- 同步 etc/ppanel.yaml 数据库连接配置
- 补齐相关需求与设计文档

initialize/migrate/database/02155_promo_schema_fix.down.sql

@@ -0,0 +1,6 @@
+-- 02155 down
+--
+-- 本迁移只是把 02154 的偏差修正回它应有的目标定义，没有引入新的列/表。
+-- 回滚 02155 并不应该把列重新改坏成 varchar/INT NULL 的旧偏差，因此 down
+-- 为空操作。若需彻底删除 promo 系统，请回滚到 02154 的 down。
+SELECT '02155 has no destructive forward step; down is a no-op.';

initialize/migrate/database/02155_promo_schema_fix.up.sql

@@ -0,0 +1,241 @@
+-- 02155 Promo Schema Fix
+--
+-- 修复历史环境中 02154 未正确执行（或部分 GORM AutoMigrate 推断）导致的
+-- promo 系统列类型 / 索引偏差。完全幂等：可重复执行。
+--
+-- 覆盖偏差：
+--   1) subscribe_promo.quantity        实际 int/NULL  ->  BIGINT NOT NULL DEFAULT 1
+--   2) subscribe_promo 唯一索引         实际 (subscribe_id, promo_rule_id)  ->  (subscribe_id, quantity, promo_rule_id)
+--   3) order.promo_rule_id             实际 int/NULL  ->  BIGINT UNSIGNED NOT NULL DEFAULT 0
+--   4) order.promo_discount            实际 varchar(255)/NULL  ->  BIGINT NOT NULL DEFAULT 0
+--
+-- 设计原则：
+--   - 所有 ALTER 前先做 NULL/空串兜底，避免 NOT NULL 转换失败。
+--   - 类型已经正确的环境（02154 正常跑过）不会被改动，所有 IF 判断都基于
+--     INFORMATION_SCHEMA 当前真实状态。
+--   - 索引差异处理 4 个分支：仅当索引确实是错的旧形态时才替换，已经是新形态则不动。
+
+
+-- ============================================================================
+-- 1) subscribe_promo.quantity
+-- ============================================================================
+
+-- 1.1 列不存在则补建（极端历史环境兜底）
+SET @col_exists = (
+  SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+  WHERE TABLE_SCHEMA = DATABASE()
+    AND TABLE_NAME = 'subscribe_promo'
+    AND COLUMN_NAME = 'quantity'
+);
+
+SET @sql = IF(
+  @col_exists = 0,
+  'ALTER TABLE `subscribe_promo` ADD COLUMN `quantity` BIGINT NOT NULL DEFAULT 1 COMMENT ''购买数量'' AFTER `subscribe_id`',
+  'SELECT ''subscribe_promo.quantity exists, skip ADD'''
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+-- 1.2 NULL 兜底为 1（旧 AutoMigrate 推断列允许 NULL，必须先回填再 NOT NULL）
+UPDATE `subscribe_promo` SET `quantity` = 1 WHERE `quantity` IS NULL;
+
+-- 1.3 类型 / 可空 / 默认值修正：只在与目标定义不一致时改
+SET @col_def_wrong = (
+  SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+  WHERE TABLE_SCHEMA = DATABASE()
+    AND TABLE_NAME = 'subscribe_promo'
+    AND COLUMN_NAME = 'quantity'
+    AND (
+         LOWER(DATA_TYPE) <> 'bigint'
+      OR IS_NULLABLE = 'YES'
+      OR COLUMN_DEFAULT IS NULL
+      OR COLUMN_DEFAULT <> '1'
+    )
+);
+
+SET @sql = IF(
+  @col_def_wrong = 1,
+  'ALTER TABLE `subscribe_promo` MODIFY COLUMN `quantity` BIGINT NOT NULL DEFAULT 1 COMMENT ''购买数量''',
+  'SELECT ''subscribe_promo.quantity already matches target definition'''
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+
+-- ============================================================================
+-- 2) subscribe_promo 唯一索引：旧形态 -> (subscribe_id, quantity, promo_rule_id)
+-- ============================================================================
+
+-- 2.1 删除已知的所有旧形态唯一索引（如果存在）
+SET @idx_exists = (
+  SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+  WHERE TABLE_SCHEMA = DATABASE()
+    AND TABLE_NAME = 'subscribe_promo'
+    AND INDEX_NAME = 'idx_subscribe_rule'
+);
+SET @sql = IF(
+  @idx_exists = 1,
+  'ALTER TABLE `subscribe_promo` DROP INDEX `idx_subscribe_rule`',
+  'SELECT ''subscribe_promo.idx_subscribe_rule absent'''
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+SET @idx_exists = (
+  SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+  WHERE TABLE_SCHEMA = DATABASE()
+    AND TABLE_NAME = 'subscribe_promo'
+    AND INDEX_NAME = 'uk_subscribe_rule'
+);
+SET @sql = IF(
+  @idx_exists = 1,
+  'ALTER TABLE `subscribe_promo` DROP INDEX `uk_subscribe_rule`',
+  'SELECT ''subscribe_promo.uk_subscribe_rule absent'''
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+SET @idx_exists = (
+  SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+  WHERE TABLE_SCHEMA = DATABASE()
+    AND TABLE_NAME = 'subscribe_promo'
+    AND INDEX_NAME = 'uk_subscribe_qty_rule'
+);
+SET @sql = IF(
+  @idx_exists = 1,
+  'ALTER TABLE `subscribe_promo` DROP INDEX `uk_subscribe_qty_rule`',
+  'SELECT ''subscribe_promo.uk_subscribe_qty_rule absent'''
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+-- 2.2 新建目标唯一索引（缺失时才建）
+SET @idx_exists = (
+  SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+  WHERE TABLE_SCHEMA = DATABASE()
+    AND TABLE_NAME = 'subscribe_promo'
+    AND INDEX_NAME = 'uk_subscribe_quantity_rule'
+);
+SET @sql = IF(
+  @idx_exists = 0,
+  'ALTER TABLE `subscribe_promo` ADD UNIQUE KEY `uk_subscribe_quantity_rule` (`subscribe_id`, `quantity`, `promo_rule_id`)',
+  'SELECT ''subscribe_promo.uk_subscribe_quantity_rule exists'''
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+
+-- ============================================================================
+-- 3) order.promo_rule_id  ->  BIGINT UNSIGNED NOT NULL DEFAULT 0
+-- ============================================================================
+
+SET @col_exists = (
+  SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+  WHERE TABLE_SCHEMA = DATABASE()
+    AND TABLE_NAME = 'order'
+    AND COLUMN_NAME = 'promo_rule_id'
+);
+
+SET @sql = IF(
+  @col_exists = 0,
+  'ALTER TABLE `order` ADD COLUMN `promo_rule_id` BIGINT UNSIGNED NOT NULL DEFAULT 0 COMMENT ''促销规则ID, 0=未使用促销'' AFTER `discount`',
+  'SELECT ''order.promo_rule_id exists, skip ADD'''
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+UPDATE `order` SET `promo_rule_id` = 0 WHERE `promo_rule_id` IS NULL;
+
+SET @col_def_wrong = (
+  SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+  WHERE TABLE_SCHEMA = DATABASE()
+    AND TABLE_NAME = 'order'
+    AND COLUMN_NAME = 'promo_rule_id'
+    AND (
+         LOWER(DATA_TYPE) <> 'bigint'
+      OR INSTR(LOWER(COLUMN_TYPE), 'unsigned') = 0
+      OR IS_NULLABLE = 'YES'
+      OR COLUMN_DEFAULT IS NULL
+      OR COLUMN_DEFAULT <> '0'
+    )
+);
+
+SET @sql = IF(
+  @col_def_wrong = 1,
+  'ALTER TABLE `order` MODIFY COLUMN `promo_rule_id` BIGINT UNSIGNED NOT NULL DEFAULT 0 COMMENT ''促销规则ID, 0=未使用促销''',
+  'SELECT ''order.promo_rule_id already matches target definition'''
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+
+-- ============================================================================
+-- 4) order.promo_discount  ->  BIGINT NOT NULL DEFAULT 0
+--    历史 AutoMigrate 推断为 varchar(255)/NULL，金额字段错存为字符串。
+--    必须先把空串/NULL 兜底为 '0'，再 MODIFY，否则 MySQL 转 BIGINT 会写 0
+--    （这里我们仍兜底显式化，避免触发 strict mode 报错）。
+-- ============================================================================
+
+SET @col_exists = (
+  SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+  WHERE TABLE_SCHEMA = DATABASE()
+    AND TABLE_NAME = 'order'
+    AND COLUMN_NAME = 'promo_discount'
+);
+
+SET @sql = IF(
+  @col_exists = 0,
+  'ALTER TABLE `order` ADD COLUMN `promo_discount` BIGINT NOT NULL DEFAULT 0 COMMENT ''促销优惠金额(分)'' AFTER `promo_rule_id`',
+  'SELECT ''order.promo_discount exists, skip ADD'''
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+-- 当且仅当当前是字符串型时做兜底（避免对已经是 BIGINT 的环境跑无谓 UPDATE）
+SET @col_is_string = (
+  SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+  WHERE TABLE_SCHEMA = DATABASE()
+    AND TABLE_NAME = 'order'
+    AND COLUMN_NAME = 'promo_discount'
+    AND LOWER(DATA_TYPE) IN ('varchar', 'char', 'text')
+);
+
+SET @sql = IF(
+  @col_is_string = 1,
+  'UPDATE `order` SET `promo_discount` = ''0'' WHERE `promo_discount` IS NULL OR `promo_discount` = ''''',
+  'SELECT ''order.promo_discount not string type, skip backfill'''
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+SET @col_def_wrong = (
+  SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+  WHERE TABLE_SCHEMA = DATABASE()
+    AND TABLE_NAME = 'order'
+    AND COLUMN_NAME = 'promo_discount'
+    AND (
+         LOWER(DATA_TYPE) <> 'bigint'
+      OR IS_NULLABLE = 'YES'
+      OR COLUMN_DEFAULT IS NULL
+      OR COLUMN_DEFAULT <> '0'
+    )
+);
+
+SET @sql = IF(
+  @col_def_wrong = 1,
+  'ALTER TABLE `order` MODIFY COLUMN `promo_discount` BIGINT NOT NULL DEFAULT 0 COMMENT ''促销优惠金额(分)''',
+  'SELECT ''order.promo_discount already matches target definition'''
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;