fix(i18n): internationalize knowledge hierarchy warning messages (14 locales)

Replace hardcoded English warning strings in ChatBotComponent.vue with i18n keys:

• chatbot.configMismatchWarning — main notification message
• chatbot.categoryNotFound — category not found in hierarchy
• chatbot.serviceLabelMismatch — UI label doesn't match hierarchy

Translations for all 14 locales: ar, bn, de, en, es, fr, id, man, pt, ru, st, sw, th, zh.