Add store logo and app icon uploads to settings page

AvatarUpload component now supports custom category and placeholder
icon props. Settings page shows two upload circles: Store Logo (for
PDFs/invoices, uses ImageIcon placeholder) and App Icon (for sidebar/
login, uses Building placeholder). Added 'company' to allowed file
entity types.

packages/backend/src/routes/v1/files.ts

@@ -41,7 +41,7 @@ export const fileRoutes: FastifyPluginAsync = async (app) => {
     }
 
     // Validate entityType is a known type
-    const allowedEntityTypes = ['user', 'member', 'member_identifier', 'product', 'rental_agreement', 'repair_ticket', 'repair_note']
+    const allowedEntityTypes = ['user', 'member', 'member_identifier', 'product', 'rental_agreement', 'repair_ticket', 'repair_note', 'company']
     if (!allowedEntityTypes.includes(entityType)) {
       throw new ValidationError(`Invalid entityType: ${entityType}`)
     }