feat(orders): PDF footer = issuer name+email, 'Zobrazit objednávku' button, per-currency list totals

- Issued-order PDF: drop the Vystavil/Schválil signature row; footer now shows
  'Vystavil: <name>' + 'E-mail: <email>' from the logged-in user (authData).
- IssuedOrderDetail PDF button 'Export PDF' -> 'Zobrazit objednávku' (already
  opens inline like invoices' 'Zobrazit fakturu').
- New /orders/stats + /issued-orders/stats endpoints sum order total (incl VAT)
  per currency across the active filter; rendered as 'Celkem: …' beneath both
  the received and issued lists. formatMultiCurrency lifted to a shared util.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/routes/admin/orders.ts

@@ -12,6 +12,7 @@ import {
 } from "../../schemas/orders.schema";
 import {
   listOrders,
+  getOrderTotals,
   getOrder,
   getOrderAttachment,
   createOrderFromQuotation,
@@ -68,6 +69,25 @@ export default async function ordersRoutes(
     },
   );
 
+  // GET /api/admin/orders/stats — per-currency total (incl. VAT) summed over the
+  // WHOLE filtered set (not one page). Must be registered BEFORE "/:id" so the
+  // literal "stats" path isn't captured as an order id.
+  fastify.get(
+    "/stats",
+    { preHandler: requirePermission("orders.view") },
+    async (request, reply) => {
+      const query = request.query as Record<string, unknown>;
+      const result = await getOrderTotals({
+        search: query.search ? String(query.search) : undefined,
+        status: query.status ? String(query.status) : undefined,
+        customer_id: query.customer_id ? Number(query.customer_id) : undefined,
+        month: query.month ? Number(query.month) : undefined,
+        year: query.year ? Number(query.year) : undefined,
+      });
+      return success(reply, { totals: result.totals });
+    },
+  );
+
   fastify.get<{ Params: { id: string } }>(
     "/:id",
     { preHandler: requirePermission("orders.view") },