added vapid id api

frontend/server/api/vapid.get.ts

@@ -0,0 +1,26 @@
+import webPush from "web-push";
+
+export default defineEventHandler(() => {
+    // Generate once and set in .env for production
+    if (process.env.NODE_ENV === "production") {
+        if (
+            !process.env.VAPID_PRIVATE_KEY ||
+            !process.env.NUXT_PUBLIC_VAPID_KEY
+        ) {
+            throw createError({
+                statusCode: 500,
+                statusMessage: "VAPID keys not configured in production",
+            });
+        }
+        return { publicKey: process.env.NUXT_PUBLIC_VAPID_KEY };
+    }
+
+    // Development: Generate and reuse
+    if (!process.env.VAPID_PRIVATE_KEY) {
+        const vapidKeys = webPush.generateVAPIDKeys();
+        process.env.VAPID_PRIVATE_KEY = vapidKeys.privateKey;
+        process.env.NUXT_PUBLIC_VAPID_KEY = vapidKeys.publicKey;
+    }
+
+    return { publicKey: process.env.NUXT_PUBLIC_VAPID_KEY };
+});