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/lib/queries/common.ts

@@ -1,11 +1,21 @@
 import { queryOptions } from "@tanstack/react-query";
 import { jsonQuery } from "../apiAdapter";
 
+export interface BankAccount {
+  id: number;
+  account_name: string;
+  bank_name: string;
+  account_number: string;
+  iban: string;
+  bic: string;
+  currency: string;
+  is_default: boolean;
+}
+
 export const bankAccountsOptions = () =>
   queryOptions({
     queryKey: ["bank-accounts"],
-    queryFn: () =>
-      jsonQuery<Record<string, unknown>[]>("/api/admin/bank-accounts"),
+    queryFn: () => jsonQuery<BankAccount[]>("/api/admin/bank-accounts"),
     staleTime: 2 * 60_000,
   });