refactor: migrated to next 16, updated fumadocs

- Deleted the empty middleware file as it was temporarily disabled for client-side i18n implementation.
- Updated `next`, `next-intl`, and `fumadocs` packages to their latest versions.
- Cleaned up the `next.config.ts` by removing the eslint configuration.
- Enhanced `tsconfig.json` with additional paths for `fumadocs-mdx`.
- Adjusted imports in `layout.tsx` and `request.ts` for better structure and functionality.

surfsense_web/proxy.ts

@@ -0,0 +1,11 @@
+// Proxy temporarily disabled for client-side i18n implementation
+// Server-side i18n routing would require restructuring entire app directory to app/[locale]/...
+// which is too invasive for this project
+
+import type { NextRequest } from "next/server";
+import { NextResponse } from "next/server";
+
+// Empty proxy - just pass through all requests
+export function proxy(request: NextRequest) {
+	return NextResponse.next();
+}