Add picture upload capabilities to the sales form for document attachments

Implements photo upload fields (recto, verso, ticket) in the NewSaleForm.tsx component.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: e80fed01-7137-4997-b9af-dad57132d430
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/db75d429-4075-4348-b179-bb283fb6d9d3.jpg

client/src/components/NewSaleForm.tsx

@@ -33,6 +33,7 @@ interface FormData {
   numeroIdentite: string;
   autoriteDelivrance: string;
   dateDelivrance: string;
+  // Photos - using camelCase for form, converted to snake_case in API
   photoRecto?: string;
   photoVerso?: string;
   photoTicket?: string;