feat(issued-orders): counterparty is now a supplier (dodavatel), not a customer

Issued orders are purchase orders WE send - they must pick from suppliers
(sklad_suppliers), not from customers. Per user decision customer_id was
REPLACED (not kept alongside): migration drops issued_orders.customer_id and
adds supplier_id FK -> sklad_suppliers (existing rows lose their counterparty
- the feature is days old; re-point them in the UI).

- service: input/filters/search (suppliers.name + ico)/enrichment/detail all
  supplier-based; create validates the supplier inside the transaction and
  update before write -> Czech 400 'Dodavatel nenalezen' instead of P2003 500;
  detail returns a minimal supplier field set (no internal notes leak)
- routes: supplier_id on list + stats; new GET /issued-orders/suppliers
  lookup (orders.view/create/edit guard - orders users lack warehouse.manage
  which guards the warehouse suppliers CRUD), active suppliers only,
  name+id ordering
- PDF: Dodavatel block now renders the supplier (name, newline-split address,
  IC/DIC), layout and both language label sets unchanged
- frontend: new SupplierPicker kit component (CustomerPicker untouched),
  IssuedOrderDetail/IssuedOrders switched to supplier_id/supplier_name; the
  picker keeps a fallback option for orders whose supplier was later
  deactivated; WarehouseSuppliers CRUD now also invalidates issued-orders so
  the picker can't go stale
- tests: issued-orders suite switched to supplier fixtures + new coverage
  (lookup shape + 403, nonexistent supplier 400, PDF supplier block)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/routes/admin/issued-orders-pdf.ts

@@ -156,6 +156,31 @@ function buildAddressLines(
   return { name, lines };
 }
 
+/**
+ * Address block for the sklad_suppliers counterparty. Unlike customers (which
+ * have structured street/city/postal columns), suppliers.address is a single
+ * Text blob — split it on newlines into one rendered line each (a blob without
+ * newlines renders as one line). IČO/DIČ come from the supplier's ico/dic
+ * columns, prefixed with the same translated labels the customer block used.
+ */
+function buildSupplierLines(
+  supplier: Record<string, unknown> | null,
+  tObj: Record<string, string>,
+): AddressResult {
+  if (!supplier) return { name: "", lines: [] };
+  const name = String(supplier.name || "");
+  const lines: string[] = [];
+  if (supplier.address) {
+    for (const part of String(supplier.address).split(/\r?\n/)) {
+      const line = part.trim();
+      if (line) lines.push(line);
+    }
+  }
+  if (supplier.ico) lines.push(`${tObj.ico}${supplier.ico}`);
+  if (supplier.dic) lines.push(`${tObj.dic}${supplier.dic}`);
+  return { name, lines };
+}
+
 /* ── Translations ────────────────────────────────────────────────── */
 
 type Lang = "cs" | "en";
@@ -165,7 +190,7 @@ const translations: Record<Lang, Record<string, string>> = {
     title: "OBJEDNÁVKA",
     heading: "OBJEDNÁVKA č.",
     // PO direction: WE (company) are the buyer (Odběratel), the
-    // selected customer record is the supplier (Dodavatel).
+    // selected sklad_suppliers record is the supplier (Dodavatel).
     supplier: "Dodavatel",
     buyer: "Odběratel",
     issue_date: "Datum vystavení:",
@@ -244,7 +269,7 @@ interface IssuedOrderPdfItem {
 export function renderIssuedOrderHtml(
   order: IssuedOrderPdfData,
   items: IssuedOrderPdfItem[],
-  customer: Record<string, unknown> | null,
+  supplier: Record<string, unknown> | null,
   settings: Record<string, unknown> | null,
   lang: Lang,
   issuer: { name: string },
@@ -268,14 +293,14 @@ export function renderIssuedOrderHtml(
   }
 
   // PO direction: our company (settings) = Odběratel (buyer);
-  // the customer record = Dodavatel (supplier).
+  // the sklad_suppliers record = Dodavatel (supplier).
   const buyer = buildAddressLines(settings, true, t); // company → Odběratel
-  const supplier = buildAddressLines(customer, false, t); // customer → Dodavatel
+  const supplierAddr = buildSupplierLines(supplier, t); // supplier → Dodavatel
 
   const buyerLinesHtml = buyer.lines
     .map((l) => `<div class="address-line">${escapeHtml(l)}</div>`)
     .join("");
-  const supplierLinesHtml = supplier.lines
+  const supplierLinesHtml = supplierAddr.lines
     .map((l) => `<div class="address-line">${escapeHtml(l)}</div>`)
     .join("");
 
@@ -450,7 +475,7 @@ export function renderIssuedOrderHtml(
     vertical-align: top;
     width: 50%;
   }
-  .header-grid td.addr-customer {
+  .header-grid td.addr-supplier {
     background: #f5f5f5;
   }
   .header-grid td.details-bank {
@@ -715,7 +740,7 @@ ${indentCSS}
     <div class="invoice-title">${escapeHtml(t.heading)} ${poNumber}</div>
   </div>
 
-  <!-- Odberatel (nase firma) / Dodavatel (zakaznik) + Detaily -->
+  <!-- Odberatel (nase firma) / Dodavatel (sklad_suppliers) + Detaily -->
   <table class="header-grid" cellspacing="0">
     <tr>
       <td>
@@ -723,9 +748,9 @@ ${indentCSS}
         <div class="address-name">${escapeHtml(buyer.name)}</div>
         ${buyerLinesHtml}
       </td>
-      <td class="addr-customer">
+      <td class="addr-supplier">
         <div class="address-label">${escapeHtml(t.supplier)}</div>
-        <div class="address-name">${escapeHtml(supplier.name)}</div>
+        <div class="address-name">${escapeHtml(supplierAddr.name)}</div>
         ${supplierLinesHtml}
       </td>
     </tr>
@@ -818,9 +843,9 @@ export default async function issuedOrdersPdfRoutes(fastify: FastifyInstance) {
           where: { issued_order_id: id },
           orderBy: { position: "asc" },
         });
-        const customer = order.customer_id
-          ? ((await prisma.customers.findUnique({
-              where: { id: order.customer_id },
+        const supplier = order.supplier_id
+          ? ((await prisma.sklad_suppliers.findUnique({
+              where: { id: order.supplier_id },
             })) as Record<string, unknown> | null)
           : null;
         const settings = (await prisma.company_settings.findFirst()) as Record<
@@ -838,7 +863,7 @@ export default async function issuedOrdersPdfRoutes(fastify: FastifyInstance) {
         const html = renderIssuedOrderHtml(
           order,
           items,
-          customer,
+          supplier,
           settings,
           lang,
           issuer,