feat(WEB-132): add middlewares, support for seamless login and improve lang based routes

middlewares/ensureLang.ts

@@ -0,0 +1,15 @@
+import { NextResponse } from "next/server"
+
+import { findLang } from "@/constants/languages"
+
+import type { NextMiddleware } from "next/server"
+
+import type { MiddlewareMatcher } from "@/types/middleware"
+
+export const middleware: NextMiddleware = () => {
+  return new NextResponse("Not found", { status: 404 })
+}
+
+export const matcher: MiddlewareMatcher = (request) => {
+  return !findLang(request.nextUrl.pathname)
+}