Fix: Disable votes on votes (#18) #349
                
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Summary
This PR fixes issue #18 by preventing users from voting on bot messages, specifically karma change messages.
Changes Made
apply_karma()method to prevent voting when the target user has a negative UID (bot/group messages)Problem Solved
Previously, when a user voted on another user's message:
Now, votes on bot messages (UIDs < 0) are silently ignored, preventing "votes on votes".
Test Plan
🤖 Generated with Claude Code
Resolves #18