refactor: merge api/recipes and api/rezepte into unified recipeLang route

Consolidate duplicate recipe API routes into a single
api/[recipeLang=recipeLang]/ structure. Both /api/recipes/ and
/api/rezepte/ URLs continue to work via the param matcher. Shared
read endpoints now serve both languages with caching for both.

Also: remove dead code (5 unused components, cookie.js) and the
redundant cron-execute recurring payment route.

src/utils/cookie.js

@@ -1,17 +0,0 @@
-// utils/cookie.js
-
-/**
- * @param {Request} request
- * @returns {string}
- */
-export function getJWTFromRequest(request) {
-  const cookies = request.headers.get("cookie") || '';
-  /** @param {string} cookie */
-  const jwtCookie = cookies.split(';').find(cookie => cookie.trim().startsWith('UserSession='));
-
-  if (jwtCookie) {
-    return jwtCookie.split('=')[1] || '';
-  }
-
-  return '';
-}