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/admin/src/lib/api-client.ts

@@ -15,8 +15,10 @@ class ApiError extends Error {
 async function request<T>(method: string, path: string, body?: unknown): Promise<T> {
   const { token } = useAuthStore.getState()
 
-  const headers: Record<string, string> = {
-    'Content-Type': 'application/json',
+  const headers: Record<string, string> = {}
+
+  if (body) {
+    headers['Content-Type'] = 'application/json'
   }
 
   if (token) {