refactor: remove translation feature

Remove the translation feature including:
- Translation services (Smesh API and LibreTranslate)
- TranslationServiceProvider and context
- TranslateButton component
- Translation settings page
- useTranslatedEvent hook
- Translation-related types and i18n strings

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/ReplyNote/index.tsx

@@ -20,7 +20,6 @@ import Nip05 from '../Nip05'
 import NoteOptions from '../NoteOptions'
 import ParentNotePreview from '../ParentNotePreview'
 import StuffStats from '../StuffStats'
-import TranslateButton from '../TranslateButton'
 import TrustScoreBadge from '../TrustScoreBadge'
 import UserAvatar from '../UserAvatar'
 import Username from '../Username'
@@ -112,10 +111,7 @@ export default function ReplyNote({
                   />
                 </div>
               </div>
-              <div className="flex items-center shrink-0">
-                <TranslateButton event={event} className="py-0" />
-                <NoteOptions event={event} className="shrink-0 [&_svg]:size-5" />
-              </div>
+              <NoteOptions event={event} className="shrink-0 [&_svg]:size-5" />
             </div>
             {parentEventId && (
               <ParentNotePreview