v4.0.3

Bug Fixes

• fix: Properly handle CHAT_TYPES= (empty) for whitelist-only mode (#7)
  • Use os.environ.get() to distinguish between 'not set' vs 'set to empty string'
  • This fixes the issue where CHAT_TYPES= in Docker/Portainer would still backup all chats instead of only explicitly included IDs
  • No more need for the CHAT_TYPES=,, workaround