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backend/src/shared-minimal/utils/formatters.ts

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+/**
+ * @ai-summary Generic formatting utilities (no business logic)
+ * @ai-context Pure functions only, no feature-specific logic
+ */
+
+export function formatDate(date: Date): string {
+  return date.toISOString().split('T')[0];
+}
+
+export function formatDateTime(date: Date): string {
+  return date.toISOString();
+}
+
+export function formatCurrency(amount: number, currency = 'USD'): string {
+  return new Intl.NumberFormat('en-US', {
+    style: 'currency',
+    currency,
+  }).format(amount);
+}
+
+export function formatDistance(meters: number): string {
+  if (meters < 1000) {
+    return `${Math.round(meters)}m`;
+  }
+  return `${(meters / 1000).toFixed(1)}km`;
+}
+
+export function formatMPG(miles: number, gallons: number): string {
+  if (gallons === 0) return '0 MPG';
+  return `${(miles / gallons).toFixed(1)} MPG`;
+}

backend/src/shared-minimal/utils/validators.ts

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+/**
+ * @ai-summary Generic validation utilities (no business logic)
+ * @ai-context Pure functions only, no feature-specific logic
+ */
+
+export function isValidEmail(email: string): boolean {
+  const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
+  return emailRegex.test(email);
+}
+
+export function isValidPhone(phone: string): boolean {
+  const phoneRegex = /^\+?[\d\s\-()]+$/;
+  return phoneRegex.test(phone) && phone.replace(/\D/g, '').length >= 10;
+}
+
+export function isValidUUID(uuid: string): boolean {
+  const uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
+  return uuidRegex.test(uuid);
+}
+
+export function isValidVIN(vin: string): boolean {
+  // VIN must be exactly 17 characters
+  if (vin.length !== 17) return false;
+  
+  // VIN cannot contain I, O, or Q
+  if (/[IOQ]/i.test(vin)) return false;
+  
+  // Must be alphanumeric
+  return /^[A-HJ-NPR-Z0-9]{17}$/i.test(vin);
+}