refactor(walkers): streamline error response handling in route

Use Fastify's reply chain to send error responses directly instead of returning Error objects. This ensures proper HTTP status codes and error messages are sent to the client.

Author: dm94

src/routes/walkers/index.ts

@@ -87,12 +87,10 @@ const routes: FastifyPluginAsync = async (server) => {
     },
     (request, reply) => {
       if (!request?.dbuser) {
-        reply.code(401);
-        return new Error("Invalid token JWT");
+        return reply.code(401).send("Invalid token JWT");
       }
       if (!request?.dbuser.clanid) {
-        reply.code(405);
-        return new Error("No clan");
+        return reply.code(405).send("No clan");
       }
 
       let pageSize: number =