feat(ECR-009): Ops-D order filters, plan display prices, refund status

LOOP-RUN-002 sample: admin order multi-filter, membership display
price catalog, read-only refund_status. No real payment or RBAC.

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

apps/api/migrations/000015_ops_commerce.up.sql

@@ -0,0 +1,26 @@
+-- Ops-D: refund_status on orders + membership plan display prices
+
+ALTER TABLE orders
+  ADD COLUMN IF NOT EXISTS refund_status TEXT NOT NULL DEFAULT 'none';
+
+ALTER TABLE orders
+  DROP CONSTRAINT IF EXISTS orders_refund_status_check;
+
+ALTER TABLE orders
+  ADD CONSTRAINT orders_refund_status_check
+  CHECK (refund_status IN ('none', 'pending', 'refunded', 'rejected'));
+
+CREATE INDEX IF NOT EXISTS idx_orders_status_created
+  ON orders (status, created_at DESC)
+  WHERE deleted_at IS NULL;
+
+CREATE TABLE IF NOT EXISTS membership_plan_prices (
+  plan TEXT PRIMARY KEY,
+  display_cents INT NOT NULL CHECK (display_cents >= 0),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+INSERT INTO membership_plan_prices(plan, display_cents) VALUES
+  ('monthly', 2800),
+  ('yearly', 19800)
+ON CONFLICT (plan) DO NOTHING;