updaded typescript to 7 and fixed few bugs

src/app/api/proxy/saveParserBackend/[[...path]]/route.ts

@@ -4,6 +4,10 @@ import { redirectRequest, respondToOPTIONS } from '@/app/api/proxy/functions'
 import { PROXY_PATHS } from '@/app/api/proxy/paths'
 import { appConfig } from '@/lib/configLoader'
 
+//TODO: remove this proxy once the backend handles CORS itself. It only exists
+// so the browser can make same-origin requests; with CORS on the backend the
+// client can call it directly and this extra hop disappears.
+
 // Forwards the incoming request to the save parser backend.
 async function redirect(req: NextRequest): Promise<NextResponse> {
     return await redirectRequest(