feat(ai): improve runtime capability reporting and context settings

Add explicit chat capability tracking, expose formatted runtime capabilities
in the info command, and support a max context size option for user AI settings.

Also update Ollama base URL resolution to use OLLAMA_ADDRESS and simplify
provider chat command execution.

locales/ru.json

@@ -41,13 +41,13 @@
   "idFromLabelText": "id пользователя",
   "idReplyLabelText": "id ответа",
   "runtimeProviderLabelText": "провайдер",
+  "runtimeProviderCurrentLabelText": "текущий",
   "runtimeModelLabelText": "модель",
   "runtimeCapabilitiesLabelText": "возможности",
   "runtimeExternalLabelText": "внешний",
   "infoAiBlockLabelText": "AI",
-  "infoSupportedProvidersLabelText": "поддерживаемые провайдеры",
+  "infoSupportedProvidersLabelText": "провайдеры",
   "infoToolsBlockLabelText": "инструменты",
-  "infoCountLabelText": "количество",
   "infoCommandsBlockLabelText": "команды",
   "infoPublicLabelText": "публичные",
   "infoPrivateLabelText": "приватные",