perf: drop redundant JSON.parse(JSON.stringify()) in recipe API

Every recipe list endpoint wrapped its result in
`JSON.parse(JSON.stringify(...))` before handing it to `json()`, which
then serialises again — a full extra stringify+parse cycle per response.
`lean()` already returns plain objects and ObjectIds/Dates serialise
correctly through `json()`'s single `JSON.stringify`, so the extra round
trip was pure waste.

Removed from the 9 output-side call sites (all_brief, category,
category/[cat], tag, tag/[tag], icon, icon/[icon], in_season/[month],
search, favorites/recipes, offline-db, translate/untranslated).
Kept the two deep-clone-before-mutation usages in items/[name] and
json-ld/[name] — those are load-bearing.

Shuffle stays server-side: moving it to the client would need a hero
preload + hydration rework that's bigger than a perf tweak.

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "homepage",
-	"version": "1.46.14",
+	"version": "1.46.15",
 	"private": true,
 	"type": "module",
 	"scripts": {