fix(db): 重编号合并后撞号 migration，并修 admin e2e base

将 015–023 双文件冲突线性化为 015–050；提供已有库 schema_migrations 修复脚本；admin Playwright 对齐 /psy/admin/ 预览路径。

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

apps/api/migrations/000020_membership_plans.up.sql

@@ -0,0 +1,27 @@
+-- ECR-014 MembershipPlan
+
+CREATE TABLE IF NOT EXISTS membership_plans (
+  code varchar(32) PRIMARY KEY,
+  title varchar(64) NOT NULL,
+  duration_days int NOT NULL CHECK (duration_days > 0),
+  amount_cents int NOT NULL CHECK (amount_cents >= 0),
+  active boolean NOT NULL DEFAULT true,
+  updated_at timestamptz NOT NULL DEFAULT now()
+);
+
+INSERT INTO membership_plans(code, title, duration_days, amount_cents, active)
+VALUES
+  ('month', '月卡', 31, 2500, true),
+  ('quarter', '季卡', 92, 6800, true),
+  ('year', '年卡', 366, 19800, true)
+ON CONFLICT (code) DO NOTHING;
+
+INSERT INTO admin_role_permissions(role_id, code)
+SELECT r.id, p.code
+FROM admin_roles r
+CROSS JOIN (VALUES
+  ('admin.membership.plans.read'),
+  ('admin.membership.plans.write')
+) AS p(code)
+WHERE r.name = 'super_admin'
+ON CONFLICT DO NOTHING;