[WIKI-565] chore: handle 404 messages in live server (#7472)

* chore: handle 404 messages in live server

* chore: removed error stack from response

apps/live/.env.example

@@ -1,3 +1,4 @@
+PORT=3100
 API_BASE_URL="http://localhost:8000"
 
 WEB_BASE_URL="http://localhost:3000"

apps/live/src/server.ts

@@ -82,14 +82,16 @@ export class Server {
         });
       } catch (error) {
         manualLogger.error("Error in /convert-document endpoint:", error);
-        res.status(500).send({
-          message: `Internal server error. ${error}`,
+        res.status(500).json({
+          message: `Internal server error.`,
         });
       }
     });
 
     this.app.use((_req: Request, res: Response) => {
-      res.status(404).send("Not Found");
+      res.status(404).json({
+        message: "Not Found",
+      });
     });
   }