umputun / tg-spam / 22197227683

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fix(spam): use SenderChat for channel ban and locator tracking

when a channel posts in a group, Telegram uses a shared fake user
Channel_Bot (ID 136817688) in msg.From. the actual channel identity
is in msg.SenderChat with unique ID and username.

- wire SenderChat.ID into spam Response and locator calls so channels
  are tracked by their real identity instead of the shared bot ID
- set channelID in MsgHandler ban request so banUserOrChannel uses
  BanChatSenderChatConfig instead of falling through to BanChatMemberConfig
- admin /spam command detects origMsg.SenderChat and passes channel ID
  for ban and cleanup
- guard against anonymous admin posts where SenderChat.ID equals the
  group chat ID, preventing the bot from trying to ban the group itself
- skip empty messages in duplicate detector

Related to #370

114 of 129 new or added lines in 4 files covered. (88.37%)

6575 of 7954 relevant lines covered (82.66%)

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