feat(sync): validate Hiboutik payloads, read French dates and guard deletions

- Hiboutik payloads are zod schemas, validated by HiboutikClient (getOne
  added for single resources: null on 404 or empty answer).
- Hiboutik dates are read as Europe/Paris whatever the server time zone.
- Paginated lists driving deletions are walked twice when they span several
  pages (brands, categories, products); categories are sorted by id.
- A customer missing from the list is deleted only once Hiboutik confirms
  it; completed orders that lost their customer are linked back.
- Each product and its versions are written in one transaction.
- An email removed in Hiboutik is erased in database.
- A 429 is retried with backoff, then stops the synchronization.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/models/hiboutikDTO/hiboutik.schema.spec.ts

@@ -0,0 +1,87 @@
+import { parseHiboutik } from './hiboutik.schema';
+import { customerAddressHiboutikSchema, fullCustomerHiboutikSchema } from './customer.hiboutik.dto';
+import { productHiboutikSchema } from './product.hiboutik.dto';
+import { saleHiboutikSchema } from './sale.hiboutik.dto';
+import { stockHiboutikSchema } from './stock.hiboutik.dto';
+
+const parse = <T extends Parameters<typeof parseHiboutik>[0]>(schema: T, data: unknown) => parseHiboutik(schema, data, '/x');
+
+describe('Hiboutik schemas', () => {
+  const product = {
+    product_id: 1,
+    product_model: 'BT21 bottle',
+    product_barcode: '8435497280048',
+    product_brand: 1,
+    product_supplier: 2,
+    product_price: '13.99',
+    product_discount_price: '0.00',
+    product_category: 19,
+    product_display_www: 1,
+    product_arch: 0,
+    products_desc: '',
+    updated_at: '2026-06-28 17:02:55',
+    product_specific_rules: [],
+  };
+
+  it('accepts ids, references and flags sent as strings', () => {
+    const parsed = parse(customerAddressHiboutikSchema, { address_id: ' 8 ', customers_id: '43', default: '0' });
+    expect(parsed.address_id).toBe(8);
+    expect(parsed.customers_id).toBe(43);
+    expect(parsed.default).toBe(0);
+  });
+
+  it('turns empty references into 0 and empty text into ""', () => {
+    const parsed = parse(productHiboutikSchema, { ...product, product_brand: '', product_category: null, products_desc: null });
+    expect(parsed.product_brand).toBe(0);
+    expect(parsed.product_category).toBe(0);
+    expect(parsed.products_desc).toBe('');
+  });
+
+  it('keeps numeric text (zip code) and prices as strings', () => {
+    expect(parse(customerAddressHiboutikSchema, { address_id: 1, zip_code: 75002 }).zip_code).toBe('75002');
+    expect(parse(productHiboutikSchema, { ...product, product_price: 13.5 }).product_price).toBe('13.5');
+  });
+
+  it('defaults missing lists to [] and strips unknown fields', () => {
+    const parsed = parse(productHiboutikSchema, { ...product, product_specific_rules: '', product_supply_price: '7.49' });
+    expect(parsed.product_specific_rules).toEqual([]);
+    expect(parsed.product_size_details).toEqual([]);
+    expect(parsed).not.toHaveProperty('product_supply_price');
+    expect(parse(saleHiboutikSchema, { sale_id: 5, total: '0.00' }).line_items).toEqual([]);
+  });
+
+  it('leaves addresses and sales undefined when they are not arrays, so that stored data is kept', () => {
+    const parsed = parse(fullCustomerHiboutikSchema, { customers_id: 1, addresses: '', sales: { error: 'x' } });
+    expect(parsed.addresses).toBeUndefined();
+    expect(parsed.sales).toBeUndefined();
+  });
+
+  it('parses stocks sent as decimal strings', () => {
+    expect(parse(stockHiboutikSchema, { product_id: '1', product_size: '0', stock_available: '3.000' })).toEqual({
+      product_id: 1,
+      product_size: 0,
+      stock_available: 3,
+    });
+  });
+
+  it.each([
+    ['a missing id', { ...product, product_id: undefined }],
+    ['a zero id', { ...product, product_id: 0 }],
+    ['a non-numeric id', { ...product, product_id: 'abc' }],
+    ['a negative reference', { ...product, product_brand: -1 }],
+    ['an invalid price', { ...product, product_price: 'free' }],
+    ['a list that is not an array', { ...product, product_size_details: { size_id: 1 } }],
+  ])('rejects %s', (_, data) => {
+    expect(() => parse(productHiboutikSchema, data)).toThrow('Unexpected answer from Hiboutik /x');
+  });
+
+  it('names the faulty fields, never their values', () => {
+    expect.assertions(2);
+    try {
+      parse(fullCustomerHiboutikSchema, { customers_id: 'jane@example.com', addresses: [{ address_id: 'Jane Doe' }] });
+    } catch (error) {
+      expect((error as Error).message).toMatch(/customers_id.*addresses\.0\.address_id/);
+      expect((error as Error).message).not.toMatch(/jane|Doe/i);
+    }
+  });
+});