v1.6.5: fix attendance unique constraint, schema sync, seed script

- Change attendance idx_attendance_user_date from unique to index (allow multiple shifts per day)
- Reset migrations to single baseline init migration
- Add seed script with admin user (admin/admin)
- Update CLAUDE.md with migration workflow documentation
- Various frontend fixes (queries, pages, hooks)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/admin/pages/OffersCustomers.tsx

@@ -7,7 +7,11 @@ import ConfirmModal from "../components/ConfirmModal";
 import FormField from "../components/FormField";
 import Forbidden from "../components/Forbidden";
 import useModalLock from "../hooks/useModalLock";
-import { offerCustomersOptions } from "../lib/queries/offers";
+import {
+  offerCustomersOptions,
+  type Customer,
+  type CustomField,
+} from "../lib/queries/offers";
 import { Skeleton } from "boneyard-js/react";
 import OffersCustomersFixture from "../fixtures/OffersCustomersFixture";
 
@@ -31,27 +35,6 @@ const CUSTOMER_FIELD_LABELS: Record<string, string> = {
   vat_id: "DIČ",
 };
 
-interface Customer {
-  id: number;
-  name: string;
-  street?: string;
-  city?: string;
-  postal_code?: string;
-  country?: string;
-  company_id?: string;
-  vat_id?: string;
-  quotation_count: number;
-  custom_fields?: CustomField[];
-  customer_field_order?: string[];
-}
-
-interface CustomField {
-  name: string;
-  value: string;
-  showLabel: boolean;
-  _key?: string;
-}
-
 interface CustomerForm {
   name: string;
   street: string;
@@ -66,9 +49,7 @@ export default function OffersCustomers() {
   const alert = useAlert();
   const { hasPermission } = useAuth();
   const queryClient = useQueryClient();
-  const { data: customers = [], isPending } = useQuery(
-    offerCustomersOptions(),
-  ) as { data: Customer[]; isPending: boolean };
+  const { data: customers = [], isPending } = useQuery(offerCustomersOptions());
   const [search, setSearch] = useState("");
 
   const [showModal, setShowModal] = useState(false);
@@ -232,6 +213,7 @@ export default function OffersCustomers() {
               : "Zákazník byl vytvořen"),
         );
         queryClient.invalidateQueries({ queryKey: ["offer-customers"] });
+        queryClient.invalidateQueries({ queryKey: ["offers"] });
       } else {
         alert.error(result.error || "Nepodařilo se uložit zákazníka");
       }
@@ -260,6 +242,7 @@ export default function OffersCustomers() {
         setDeleteConfirm({ show: false, customer: null });
         alert.success(result.message || "Zákazník byl smazán");
         queryClient.invalidateQueries({ queryKey: ["offer-customers"] });
+        queryClient.invalidateQueries({ queryKey: ["offers"] });
       } else {
         alert.error(result.error || "Nepodařilo se smazat zákazníka");
       }
@@ -270,7 +253,7 @@ export default function OffersCustomers() {
     }
   };
 
-  if (!hasPermission("offers.view")) return <Forbidden />;
+  if (!hasPermission("customers.view")) return <Forbidden />;
 
   const filteredCustomers = search
     ? customers.filter(
@@ -300,7 +283,7 @@ export default function OffersCustomers() {
             <h1 className="admin-page-title">Zákazníci</h1>
             <p className="admin-page-subtitle">Správa zákazníků pro nabídky</p>
           </div>
-          {hasPermission("offers.create") && (
+          {hasPermission("customers.create") && (
             <button
               onClick={openCreateModal}
               className="admin-btn admin-btn-primary"
@@ -345,7 +328,7 @@ export default function OffersCustomers() {
                     ? "Žádní zákazníci odpovídající hledání."
                     : "Zatím nejsou žádní zákazníci."}
                 </p>
-                {!search && hasPermission("offers.create") && (
+                {!search && hasPermission("customers.create") && (
                   <button
                     onClick={openCreateModal}
                     className="admin-btn admin-btn-primary"
@@ -398,7 +381,7 @@ export default function OffersCustomers() {
                         </td>
                         <td>
                           <div className="admin-table-actions">
-                            {hasPermission("offers.edit") && (
+                            {hasPermission("customers.edit") && (
                               <button
                                 onClick={() => openEditModal(customer)}
                                 className="admin-btn-icon"
@@ -418,7 +401,7 @@ export default function OffersCustomers() {
                                 </svg>
                               </button>
                             )}
-                            {hasPermission("offers.delete") && (
+                            {hasPermission("customers.delete") && (
                               <button
                                 onClick={() =>
                                   setDeleteConfirm({ show: true, customer })