update: upgrade @pezkuwi/api to 16.5.36, clean up images and assets

- Upgrade @pezkuwi/api 16.5.11 -> 16.5.36 in supabase edge functions
- Remove manual SS58-to-hex workaround, use native SS58 addresses
- Add kurdistan flag and Dijital Kurdistan images
- Add PezkuwiExplorer to web public assets
- Remove unused react-logo and telegram_welcome images
- Add *.bak to gitignore

.gitignore

@@ -156,3 +156,6 @@ COMMISSION_SYSTEM_SUMMARY - Copy.md:Zone.Identifier
 # APK files (too large for GitHub)
 *.apk
 mobile/credentials.json
+
+# Backup files
+*.bak