fix(i18n): restore three placeholders dropped from the pt catalogue (#11325)

Validated on a 17-PR combined board: i18n-placeholder-parity within the board's 287/287, typecheck:core clean. Restores 3 dropped placeholders in pt.json (the visible one: the cache tile's subtitle was repeating its own label instead of showing the total) and adds a 42-locale placeholder-set gate so this class of drift can't recur silently. Thank you @ntdat812!

src/i18n/messages/pt.json

@@ -4242,7 +4242,7 @@
     "smokeSendSuccessWithTask": "message/send ok (tarefa {taskId}).",
     "smokeSendSuccess": "message/send ok.",
     "smokeStreamFailed": "Teste de fumo message/stream falhou.",
-    "smokeStreamSuccessWithTask": "message/stream ok (tarefa {taskId}).",
+    "smokeStreamSuccessWithTask": "message/stream ok (tarefa {taskId}{stateSuffix}).",
     "smokeStreamNoTaskId": "message/stream terminou sem ID de tarefa.",
     "health": "Estado de saúde",
     "ok": "OK",
@@ -10202,7 +10202,7 @@
     "scanning": "A analisar...",
     "opencodeIntegration": "Integração OpenCode",
     "opencodeDetected": "opencode {version} detetado",
-    "opencodeDesc": "Gera um {configFile} pronto a usar com a tua configuração OmniRoute",
+    "opencodeDesc": "Gera um {configFile} pronto a usar com o URL base do OmniRoute e todos os modelos disponíveis — coloca-o na raiz do teu projeto e executa {command}.",
     "downloadConfig": "Descarregar {file}",
     "downloaded": "Descarregado!",
     "setupGuideTitle": "Guia de configuração",
@@ -10395,7 +10395,7 @@
     "dbEntries": "Entradas na BD",
     "dbEntriesSub": "Persistido (SQLite)",
     "cacheHits": "Acertos de cache",
-    "cacheHitsSub": "Acertos",
+    "cacheHitsSub": "de {total} no total",
     "tokensSaved": "Tokens Poupançados",
     "tokensSavedSub": "Estimado a partir de acertos",
     "hitRate": "Taxa de acertos",