feat: duplicate your own recipe

The fork endpoint already had no "isn't yours" check, so this is a
UI-only change: ForkRecipeButton takes a variant prop ("fork" for
others' recipes, "duplicate" for your own) that swaps icon/label/toast
copy, and now renders unconditionally instead of only for non-owners.

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

apps/web/messages/fr.json

@@ -122,6 +122,8 @@
     "forked": "Recette copiée dans votre bibliothèque",
     "forkFailed": "Échec de la copie de la recette",
     "forkLimitReached": "Limite de recettes atteinte pour votre offre",
+    "duplicateTooltip": "Dupliquer cette recette",
+    "duplicated": "Recette dupliquée",
     "forkedFrom": "Copiée depuis {title}",
     "pairingFindingLabel": "Recherche des meilleurs accords…",
     "pairingSuggestButton": "Suggérer des accompagnements",