feat(offers,invoices): per-currency 'Celkem' totals beneath the lists (consistent with orders)

Mirrors the orders totals exactly: /stats (offers) + /list-totals (issued +
received invoices) endpoints sum each doc's total per currency across the active
filter (reusing extracted where-builders so they stay in sync with the lists),
rendered as the identical 'Celkem: …' block via the shared formatMultiCurrency.
Existing invoice/received KPI stats untouched.

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

src/routes/admin/quotations.ts

@@ -11,6 +11,7 @@ import {
 import prisma from "../../config/database";
 import {
   listOffers,
+  getOfferTotals,
   getOffer,
   createOffer,
   updateOffer,
@@ -52,6 +53,24 @@ export default async function quotationsRoutes(
     },
   );
 
+  // GET /api/admin/offers/stats — per-currency total (incl. VAT) summed over the
+  // WHOLE filtered set (not one page). Offers have NO month/year filter; the
+  // list filters by search + status + customer_id, so the totals use the same.
+  // Registered BEFORE "/:id" so the literal "stats" path isn't captured as an id.
+  fastify.get(
+    "/stats",
+    { preHandler: requirePermission("offers.view") },
+    async (request, reply) => {
+      const query = request.query as Record<string, unknown>;
+      const result = await getOfferTotals({
+        search: query.search ? String(query.search) : undefined,
+        status: query.status ? String(query.status) : undefined,
+        customer_id: query.customer_id ? Number(query.customer_id) : undefined,
+      });
+      return success(reply, { totals: result.totals });
+    },
+  );
+
   // GET /api/admin/offers/next-number
   fastify.get(
     "/next-number",