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security(pds): enable invite requirement after spam attack master

Deleted 41 spam bot accounts that were created between Dec 26-28. All accounts used rotating residential proxies and followed the same pattern: Brazilian-style names, no profiles, only follows/likes/reposts. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>