Fix DELETE sending empty JSON body, add repair_note to allowed file entity types

API client no longer sets Content-Type: application/json on requests
without a body (fixes DELETE 400 errors). Added repair_note to the
allowed entityTypes whitelist for file uploads so photos can be
attached to repair notes.

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

@@ -42,7 +42,7 @@ export const fileRoutes: FastifyPluginAsync = async (app) => {
     }
 
     // Validate entityType is a known type
-    const allowedEntityTypes = ['user', 'member', 'member_identifier', 'product', 'rental_agreement', 'repair_ticket']
+    const allowedEntityTypes = ['user', 'member', 'member_identifier', 'product', 'rental_agreement', 'repair_ticket', 'repair_note']
     if (!allowedEntityTypes.includes(entityType)) {
       throw new ValidationError(`Invalid entityType: ${entityType}`)
     }