feat(core): add system settings, currency, tax, sequence API hooks

frontend/src/api/hooks.ts

@@ -553,3 +553,175 @@ export function useDeleteRole() {
     },
   });
 }
+
+// ═══════════════════════════════════════════════════════════════
+// System Settings, Currency, Tax, Sequence hooks
+// ═══════════════════════════════════════════════════════════════
+
+export interface Currency {
+  id: string;
+  code: string;
+  name: string;
+  symbol: string;
+  is_default: boolean;
+  created_at?: string;
+  updated_at?: string;
+}
+
+export interface TaxRate {
+  id: string;
+  name: string;
+  rate: number;
+  is_default: boolean;
+  country?: string | null;
+  created_at?: string;
+  updated_at?: string;
+}
+
+export interface Sequence {
+  id: string;
+  name: string;
+  prefix: string;
+  next_number: number;
+  padding: number;
+  created_at?: string;
+  updated_at?: string;
+}
+
+export interface SystemSettings {
+  id?: string;
+  company_name: string;
+  company_legal_form?: string | null;
+  company_street: string;
+  company_city: string;
+  company_zip: string;
+  company_country: string;
+  tax_number?: string | null;
+  vat_id?: string | null;
+  iban?: string | null;
+  bic?: string | null;
+  bank_name?: string | null;
+  ceo?: string | null;
+  trade_register?: string | null;
+  default_currency_id?: string | null;
+  default_tax_id?: string | null;
+  invoice_prefix: string;
+  quote_prefix: string;
+  payment_terms_days: number;
+  created_at?: string;
+  updated_at?: string;
+}
+
+// System Settings
+export function useSystemSettings() {
+  return useQuery({
+    queryKey: ['systemSettings'],
+    queryFn: () => apiGet<SystemSettings>('/system-settings'),
+  });
+}
+
+export function useUpdateSystemSettings() {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: (data: Partial<SystemSettings>) => apiClient.put('/system-settings', data).then(r => r.data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['systemSettings'] });
+    },
+  });
+}
+
+// Currencies
+export function useCurrencies() {
+  return useQuery({
+    queryKey: ['currencies'],
+    queryFn: () => apiGet<{ items: Currency[]; total: number }>('/currencies'),
+  });
+}
+
+export function useCreateCurrency() {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: (data: Partial<Currency>) => apiPost('/currencies', data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['currencies'] });
+    },
+  });
+}
+
+export function useUpdateCurrency() {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: ({ id, data }: { id: string; data: Partial<Currency> }) =>
+      apiPatch(`/currencies/${id}`, data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['currencies'] });
+    },
+  });
+}
+
+export function useDeleteCurrency() {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: (id: string) => apiDelete(`/currencies/${id}`),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['currencies'] });
+    },
+  });
+}
+
+// Taxes
+export function useTaxes() {
+  return useQuery({
+    queryKey: ['taxes'],
+    queryFn: () => apiGet<{ items: TaxRate[]; total: number }>('/taxes'),
+  });
+}
+
+export function useCreateTax() {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: (data: Partial<TaxRate>) => apiPost('/taxes', data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['taxes'] });
+    },
+  });
+}
+
+export function useUpdateTax() {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: ({ id, data }: { id: string; data: Partial<TaxRate> }) =>
+      apiPatch(`/taxes/${id}`, data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['taxes'] });
+    },
+  });
+}
+
+export function useDeleteTax() {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: (id: string) => apiDelete(`/taxes/${id}`),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['taxes'] });
+    },
+  });
+}
+
+// Sequences
+export function useSequences() {
+  return useQuery({
+    queryKey: ['sequences'],
+    queryFn: () => apiGet<{ items: Sequence[]; total: number }>('/sequences'),
+  });
+}
+
+export function useCreateSequence() {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: (data: Partial<Sequence>) => apiPost('/sequences', data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['sequences'] });
+    },
+  });
+}