feat(sync): add converters from Hiboutik DTOs to Prisma inputs

Includes helpers for Hiboutik dates ("0000-00-00" is ignored) and optional prices ("0.00" means no value).

src/utils/date.spec.ts

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+import { parseHiboutikDate } from './date';
+
+describe('parseHiboutikDate', () => {
+  it('parses a Hiboutik datetime', () => {
+    expect(parseHiboutikDate('2026-06-28 17:02:55')).toEqual(new Date('2026-06-28T17:02:55'));
+  });
+
+  it('parses a date without time', () => {
+    expect(parseHiboutikDate('1990-05-12')).toEqual(new Date('1990-05-12'));
+  });
+
+  it.each(['', '0000-00-00', '0000-00-00 00:00:00', 'not a date', null, undefined])('returns undefined for %p', (value) => {
+    expect(parseHiboutikDate(value)).toBeUndefined();
+  });
+});

src/utils/date.ts

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+/**
+ * Parses a Hiboutik date ("YYYY-MM-DD HH:mm:ss" or "YYYY-MM-DD").
+ * Returns undefined for empty or invalid dates (e.g. "0000-00-00").
+ */
+export function parseHiboutikDate(value: string | null | undefined): Date | undefined {
+  if (!value) return undefined;
+
+  const date = new Date(value.trim().replace(' ', 'T'));
+  return isNaN(date.getTime()) ? undefined : date;
+}

src/utils/price.spec.ts

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+import { parseOptionalHiboutikPrice } from './price';
+
+describe('parseOptionalHiboutikPrice', () => {
+  it('keeps a positive price', () => {
+    expect(parseOptionalHiboutikPrice('12.50')).toBe('12.50');
+  });
+
+  it.each(['0.00', '0', '', 'abc', '-1.00', null, undefined])('returns null for %p', (value) => {
+    expect(parseOptionalHiboutikPrice(value)).toBeNull();
+  });
+});

src/utils/price.ts

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+/**
+ * Parses an optional Hiboutik price (discount price, size price override).
+ * Hiboutik sends "0.00" when the value is not set: returns null for empty, zero or invalid values.
+ */
+export function parseOptionalHiboutikPrice(value: string | null | undefined): string | null {
+  if (!value) return null;
+
+  const price = Number(value);
+  return Number.isFinite(price) && price > 0 ? value : null;
+}