umputun / tg-spam / 19082335171

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Skip spam checks for anonymous admin posts (#331)

* feat: skip spam checks for anonymous admin posts

Implements automatic exclusion of anonymous admin posts from spam detection while maintaining spam checks for channel forwards and regular users.

Changes:
- Added check in listener.go to skip spam detection when msg.SenderChat.ID == fromChat
- Added comprehensive test coverage with 4 test cases
- Updated README.md to document the behavior

Behavior:
- Anonymous admin posts (when admins post "as the group") skip spam check
- Channel auto-forwards (SenderChat.ID != chat ID) still checked for spam
- Regular user messages (no SenderChat) still checked for spam
- Works uniformly across primary group, testing chats, and all allowed chats

The fix compares msg.SenderChat.ID to fromChat (the actual chat the message came from) rather than l.chatID, ensuring proper handling of anonymous admin posts in testing chats configured via --testing-id.

Related to #330

* docs: add clarifying comment for SenderChat check

Explains that when admins post 'as the group', SenderChat.ID equals the group's chat ID. This clarifies why checking ID != 0 is sufficient (it's a struct value, not a pointer).

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