Start integrating the onboarding flow with backend 12

frontend/src/hooks/business/onboarding/services/useTenantCreation.ts

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+/**
+ * Tenant creation service - Clean, standardized implementation
+ */
+
+import { useCallback } from 'react';
+import { useRegisterBakery } from '../../../../api';
+import { useTenantStore } from '../../../../stores/tenant.store';
+import { useOnboardingStore } from '../core/store';
+import { createServiceHook } from '../utils/createServiceHook';
+import type { TenantCreationState } from '../core/types';
+import type { BakeryRegistration, TenantResponse } from '../../../../api';
+
+const useTenantCreationService = createServiceHook<TenantCreationState>({
+  initialState: {
+    tenantData: null,
+  },
+});
+
+export const useTenantCreation = () => {
+  const service = useTenantCreationService();
+  const registerBakeryMutation = useRegisterBakery();
+  const { setCurrentTenant, loadUserTenants } = useTenantStore();
+  const { setStepData } = useOnboardingStore();
+
+  const createTenant = useCallback(async (bakeryData: BakeryRegistration): Promise<boolean> => {
+    if (!bakeryData) {
+      service.setError('Los datos de la panadería son requeridos');
+      return false;
+    }
+
+    const result = await service.executeAsync(async () => {
+      // Call API to register bakery
+      const tenantResponse: TenantResponse = await registerBakeryMutation.mutateAsync(bakeryData);
+      
+      // Update tenant store
+      console.log('useTenantCreation - Setting current tenant:', tenantResponse);
+      setCurrentTenant(tenantResponse);
+      
+      // Reload user tenants
+      await loadUserTenants();
+      
+      // Update onboarding data
+      setStepData('setup', {
+        bakery: {
+          ...bakeryData,
+          tenantCreated: true,
+          tenant_id: tenantResponse.id,
+        } as any,
+      });
+      
+      console.log('useTenantCreation - Tenant created and set successfully');
+      return tenantResponse;
+    });
+
+    return result.success;
+  }, [service, registerBakeryMutation, setCurrentTenant, loadUserTenants, setStepData]);
+
+  return {
+    // State
+    isLoading: service.isLoading,
+    error: service.error,
+    isSuccess: service.isSuccess,
+    tenantData: service.tenantData,
+    
+    // Actions
+    createTenant,
+    clearError: service.clearError,
+    reset: service.reset,
+  };
+};