feat(config): add API route for app configuration and update related logic for monitor guild

src/routes/appConfigRoutes.ts

@@ -0,0 +1,15 @@
+import type { Router } from "express";
+import express from "express";
+import { config } from "../config.js";
+
+export function createAppConfigRoutes(): Router {
+  const router = express.Router();
+
+  router.get("/config", (_req, res) => {
+    res.json({
+      monitorGuildId: config.MONITOR_GUILD_ID ?? null,
+    });
+  });
+
+  return router;
+}