feat: implement admin authentication middleware and API endpoint

- Add `auth.ts` middleware for session validation in server.
- Update `auth.ts` in middleware to use async and fetch ping API.
- Modify `admin.vue` to utilize `useAuthStore()` for state management.
- Introduce `ping.ts` API in server for admin route validation.

middleware/auth.ts

-export default defineNuxtRouteMiddleware((to) => {
+export default defineNuxtRouteMiddleware(async () => {
     const hasToken = useCookie('session_token');
-    if (!hasToken && to.path.startsWith('/admin')) {
+    if (!hasToken) {
+        return navigateTo('/login');
+    }
+
+    let isAuthorized = false;
+    await useFetch('/api/admin/ping', {
+        onResponse({response}) {
+            console.log(response.ok);
+            if (response.ok) {
+                isAuthorized = true;
+            }
+        }
+    });
+
+    if (!isAuthorized) {
         return navigateTo('/login');
     }
 });
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pages/admin.vue

 <script setup lang="ts">
 definePageMeta({
   middleware: 'auth'
-})
+});
+
+useAuthStore();
+
 </script>
 
 <template>

server/api/admin/ping.ts

+import {EventHandlerRequest, H3Event} from "h3";
+
+export default defineEventHandler(async () => {
+    return "pong";
+});
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server/middleware/auth.ts

+import {EventHandlerRequest, H3Event} from "h3";
+import prisma from "~/lib/prisma";
+
+export default defineEventHandler(async (event: H3Event<EventHandlerRequest>) => {
+    if (!event.path.startsWith('/admin/')) {
+        return;
+    }
+
+    const sessionToken = getCookie(event, 'session_token');
+    const sessionUserId = getCookie(event, 'userId');
+    console.log(sessionToken, sessionUserId);
+
+    if (!sessionToken || !sessionUserId) {
+        throw createError({statusCode: 401, statusMessage: 'Unauthorized'});
+    }
+
+    const dateNow = new Date();
+    const session = await prisma.session.findUnique({
+        where: {
+            token: sessionToken,
+            expiresAt: {
+                gte: dateNow,
+            }
+        },
+    });
+
+    if (!session) {
+        throw createError({statusCode: 401, statusMessage: 'Unauthorized'});
+    }
+
+    if (session.userId.toString() !== sessionUserId) {
+        throw createError({statusCode: 401, statusMessage: 'Unauthorized'});
+    }
+});
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