feat(suppliers)!: full customers model - structured address + custom fields

The dodavatele modal is now an exact mirror of the customers modal
(minus the PDF field-order picker): Nazev+ARES, Ulice, Mesto+PSC, Zeme,
ICO+ARES, DIC, and the same "Vlastni pole" editor (maxWidth md).

Two migrations on sklad_suppliers:
- structured street/city/postal_code/country replace the free-text
  address blob (best-effort split: street / PSC regex / city)
- custom_fields LONGTEXT replaces contact_person/email/phone/notes;
  existing values are preserved as labeled custom fields

The encode/decode of the custom_fields blob is shared with customers
via the new utils/custom-fields.ts. The PO PDF supplier block renders
the structured address + custom-field lines like the customer block;
the supplier picker/detail selects and types follow. Legacy clients
sending the dropped keys are silently stripped (tested). Suppliers
list shows Ulice/Mesto instead of the dropped contact columns; search
covers name/ico/city.

BREAKING CHANGE: sklad_suppliers.address, contact_person, email,
phone, notes columns dropped (data migrated); deploy must run
prisma migrate deploy + generate.

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

src/routes/admin/warehouse.ts

@@ -7,6 +7,10 @@ import { logAudit } from "../../services/audit";
 import { success, error, parseId, paginated } from "../../utils/response";
 import { contentDisposition } from "../../utils/content-disposition";
 import { parsePagination, buildPaginationMeta } from "../../utils/pagination";
+import {
+  encodeCustomFields,
+  decodeCustomFields,
+} from "../../utils/custom-fields";
 import { parseBody } from "../../schemas/common";
 import { nasInvoicesManager } from "../../services/nas-financials-manager";
 import {
@@ -226,7 +230,7 @@ export default async function warehouseRoutes(
   // SUPPLIERS
   // =============================================================
 
-  // GET /suppliers — paginated list, search by name/ico/contact_person
+  // GET /suppliers — paginated list, search by name/ico/city
   fastify.get(
     "/suppliers",
     { preHandler: requirePermission("warehouse.manage") },
@@ -240,7 +244,7 @@ export default async function warehouseRoutes(
         where.OR = [
           { name: { contains: search } },
           { ico: { contains: search } },
-          { contact_person: { contains: search } },
+          { city: { contains: search } },
         ];
       }
 
@@ -254,9 +258,16 @@ export default async function warehouseRoutes(
         prisma.sklad_suppliers.count({ where }),
       ]);
 
+      // Decode the custom_fields blob into the array shape the modal edits
+      // (same model as customers).
+      const enriched = suppliers.map((s) => ({
+        ...s,
+        custom_fields: decodeCustomFields(s.custom_fields).custom_fields,
+      }));
+
       return paginated(
         reply,
-        suppliers,
+        enriched,
         buildPaginationMeta(total, page, limit),
       );
     },
@@ -275,7 +286,10 @@ export default async function warehouseRoutes(
       });
       if (!supplier) return error(reply, "Dodavatel nenalezen", 404);
 
-      return success(reply, supplier);
+      return success(reply, {
+        ...supplier,
+        custom_fields: decodeCustomFields(supplier.custom_fields).custom_fields,
+      });
     },
   );
 
@@ -293,11 +307,12 @@ export default async function warehouseRoutes(
           name: body.name,
           ico: body.ico ?? null,
           dic: body.dic ?? null,
-          contact_person: body.contact_person ?? null,
-          email: body.email ?? null,
-          phone: body.phone ?? null,
-          address: body.address ?? null,
-          notes: body.notes ?? null,
+          street: body.street ?? null,
+          city: body.city ?? null,
+          postal_code: body.postal_code ?? null,
+          country: body.country ?? null,
+          // Suppliers have no PDF field-order picker — order is always [].
+          custom_fields: encodeCustomFields(body.custom_fields, []),
           is_active: body.is_active ?? true,
         },
       });
@@ -312,7 +327,7 @@ export default async function warehouseRoutes(
         newValues: {
           name: supplier.name,
           ico: supplier.ico,
-          contact_person: supplier.contact_person,
+          city: supplier.city,
           is_active: supplier.is_active,
         },
       });
@@ -342,12 +357,13 @@ export default async function warehouseRoutes(
       if (body.name !== undefined) updateData.name = body.name;
       if (body.ico !== undefined) updateData.ico = body.ico;
       if (body.dic !== undefined) updateData.dic = body.dic;
-      if (body.contact_person !== undefined)
-        updateData.contact_person = body.contact_person;
-      if (body.email !== undefined) updateData.email = body.email;
-      if (body.phone !== undefined) updateData.phone = body.phone;
-      if (body.address !== undefined) updateData.address = body.address;
-      if (body.notes !== undefined) updateData.notes = body.notes;
+      if (body.street !== undefined) updateData.street = body.street;
+      if (body.city !== undefined) updateData.city = body.city;
+      if (body.postal_code !== undefined)
+        updateData.postal_code = body.postal_code;
+      if (body.country !== undefined) updateData.country = body.country;
+      if (body.custom_fields !== undefined)
+        updateData.custom_fields = encodeCustomFields(body.custom_fields, []);
       if (body.is_active !== undefined) updateData.is_active = body.is_active;
 
       const updated = await prisma.sklad_suppliers.update({
@@ -365,13 +381,13 @@ export default async function warehouseRoutes(
         oldValues: {
           name: existing.name,
           ico: existing.ico,
-          contact_person: existing.contact_person,
+          city: existing.city,
           is_active: existing.is_active,
         },
         newValues: {
           name: updated.name,
           ico: updated.ico,
-          contact_person: updated.contact_person,
+          city: updated.city,
           is_active: updated.is_active,
         },
       });