feat(orders): fluxo de aprovação — approve/reject endpoints + UIs (C5)

PATCH /orders/:id/approve e /reject com alçada role-gated; OrderDetailPage
com modais de aprovação e recusa; ApprovalQueuePage para Sandra; badge de
pendências na Sidebar; DevLogin com 4 perfis (rep, supervisor, gerente).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

libs/shared/api-interface/src/lib/order.contract.ts

@@ -112,3 +112,17 @@ export const CreateOrderSchema = z.object({
   items: z.array(CreateOrderItemSchema).min(1),
 });
 export type CreateOrder = z.infer<typeof CreateOrderSchema>;
+
+// ─── Approve / Reject (PATCH /orders/:id/approve|reject) ─────────────────────
+
+export const ApproveOrderSchema = z.object({
+  // Opcional — supervisor pode ajustar o desconto global. Se omitido, mantém o original.
+  discountPct: z.number().min(0).max(100).optional(),
+  note: z.string().optional(),
+});
+export type ApproveOrder = z.infer<typeof ApproveOrderSchema>;
+
+export const RejectOrderSchema = z.object({
+  reason: z.string().min(1, 'Motivo é obrigatório'), // FR-5.4
+});
+export type RejectOrder = z.infer<typeof RejectOrderSchema>;