feat(ECR-015): RedemptionCode 兑换码并 Closed

批次生成/作废、C 端兑码延长会员；admin-h5 /codes。
Loop continuous。Next：ECR-016 UserIntelligence。

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/migrations/000018_redemption_codes.down.sql

@@ -0,0 +1,4 @@
+DELETE FROM admin_role_permissions
+WHERE code IN ('admin.membership.codes.read', 'admin.membership.codes.write');
+DROP TABLE IF EXISTS redemption_codes;
+DROP TABLE IF EXISTS redemption_batches;

apps/api/migrations/000018_redemption_codes.up.sql

@@ -0,0 +1,35 @@
+-- ECR-015 RedemptionCode
+
+CREATE TABLE IF NOT EXISTS redemption_batches (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  label varchar(64) NOT NULL,
+  plan_code varchar(32) NOT NULL REFERENCES membership_plans(code),
+  quantity int NOT NULL CHECK (quantity > 0 AND quantity <= 100),
+  created_by uuid NOT NULL REFERENCES admin_accounts(id),
+  created_at timestamptz NOT NULL DEFAULT now()
+);
+
+CREATE TABLE IF NOT EXISTS redemption_codes (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  batch_id uuid NOT NULL REFERENCES redemption_batches(id) ON DELETE CASCADE,
+  code varchar(32) NOT NULL UNIQUE,
+  plan_code varchar(32) NOT NULL REFERENCES membership_plans(code),
+  status varchar(16) NOT NULL DEFAULT 'unused'
+    CHECK (status IN ('unused','redeemed','disabled')),
+  redeemed_by uuid NULL REFERENCES users(id),
+  redeemed_at timestamptz NULL,
+  created_at timestamptz NOT NULL DEFAULT now()
+);
+
+CREATE INDEX IF NOT EXISTS idx_redemption_codes_batch ON redemption_codes(batch_id);
+CREATE INDEX IF NOT EXISTS idx_redemption_codes_status ON redemption_codes(status);
+
+INSERT INTO admin_role_permissions(role_id, code)
+SELECT r.id, p.code
+FROM admin_roles r
+CROSS JOIN (VALUES
+  ('admin.membership.codes.read'),
+  ('admin.membership.codes.write')
+) AS p(code)
+WHERE r.name = 'super_admin'
+ON CONFLICT DO NOTHING;