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/package.json

@@ -66,16 +66,16 @@
 		"dotenv": "^17.2.3",
 		"drizzle-orm": "^0.44.5",
 		"emblor": "^1.4.8",
-		"fumadocs-core": "^15.6.6",
-		"fumadocs-mdx": "^11.7.1",
-		"fumadocs-ui": "^15.6.6",
+		"fumadocs-core": "^16.3.1",
+		"fumadocs-mdx": "^14.2.1",
+		"fumadocs-ui": "^16.3.1",
 		"geist": "^1.4.2",
 		"jotai": "^2.15.1",
 		"jotai-tanstack-query": "^0.11.0",
 		"lucide-react": "^0.477.0",
 		"motion": "^12.23.22",
-		"next": "^15.5.9",
-		"next-intl": "^3.26.5",
+		"next": "^16.1.0",
+		"next-intl": "^4.6.1",
 		"next-themes": "^0.4.6",
 		"pg": "^8.16.3",
 		"postgres": "^3.4.7",
@@ -93,10 +93,11 @@
 		"rehype-raw": "^7.0.0",
 		"rehype-sanitize": "^6.0.0",
 		"remark-gfm": "^4.0.1",
+		"server-only": "^0.0.1",
 		"sonner": "^2.0.6",
 		"tailwind-merge": "^3.3.1",
 		"tailwindcss-animate": "^1.0.7",
-		"zod": "^3.25.76"
+		"zod": "^4.2.1"
 	},
 	"devDependencies": {
 		"@biomejs/biome": "2.1.2",