fix(catalog/ford): disambiguate identical catCode buttons + relabel "Model Yılı" → "Varyant"

Two visible defects when a user picks a Ford model (variant selector step):

1. **N identical buttons.** Ford's `modelFamilyToModelList` gives every sub-catCode
   the same caption — just the family name. parseFordCatCodesForFamily returned
   `[{code:CBV,name:Kuga},{code:CBS,name:Kuga},{code:CTD,name:Kuga}]` for Kuga
   2012-2020. The UI rendered three indistinguishable "Kuga" pills with no way
   for the user to tell them apart. Same on Galaxy ("Galaxy"/"Galaxy"), every
   multi-catCode family.

   Fix: detect duplicate baseNames per family and graft a disambiguator —
   year first (friendliest), catCode as a last resort. Result:
   "Kuga (2013-2016)" / "Kuga (2016-2020)" / "Kuga (CTD)" — or, when year is
   present even for unique entries, always include it for a uniform look.

2. **Section title was lying.** UI label was `catalog.fordVariant.modelYear`
   = "Model Yılı" ("Model Year") but for Ford LEGACY these are catCodes
   (generation identifiers), not years. Rename the key value to "Varyant" /
   "Variant" — semantically correct for both Ford catCodes and Volvo years
   (Volvo flows through the same selector and its codes ARE years; "Varyant"
   covers both).

Cleared the affected Redis cache (`pl24:ford:config:*`) on dev so the next
hit fetches fresh disambiguated data; prod cache will roll over on its own
TTL after promote.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/web/src/messages/en.json

@@ -213,7 +213,7 @@
     "fordVariant": {
       "title": "Select Model",
       "subtitle": "Optional — use Show All to browse all variants",
-      "modelYear": "Model Year",
+      "modelYear": "Variant",
       "engine": "Engine",
       "gearbox": "Gearbox",
       "showAll": "Show All",

apps/web/src/messages/tr.json

@@ -213,7 +213,7 @@
     "fordVariant": {
       "title": "Model Seçin",
       "subtitle": "İsteğe bağlı — tüm varyantlar için Tümü seçeneğini kullanın",
-      "modelYear": "Model Yılı",
+      "modelYear": "Varyant",
       "engine": "Motor",
       "gearbox": "Şanzıman",
       "showAll": "Tümü",