fix: show recipe author with profile link on the recipe view page

/recipes/[id] never queried or displayed author info at all — viewing
someone else's public/unlisted recipe gave no way to see or visit
whoever wrote it. Add the author relation to the query and render an
avatar + "by {name}" link to /u/[username] under the title (hidden for
the owner's own recipes).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/web/messages/en.json

@@ -29,6 +29,7 @@
     "mention": "{name} mentioned you in a comment"
   },
   "recipe": {
+    "byAuthor": "by {name}",
     "source": "Source",
     "share": "Share",
     "shareLinkCopied": "Link copied to clipboard",