feat: add SelfbotGuard v1.0.0 — advanced selfbot detection & punishment
Detection heuristics:
- Rich-embed abuse (user accounts can't send rich embeds)
- Inhuman response speed (<300ms consistently)
- Message timing precision analysis
- 24/7 activity profiling
- Automated command-response pattern matching
- Rapid-fire burst detection
Configurable per-server:
- Toggle on/off (default: off)
- Actions: log, warn, mute, kick, ban
- Sensitivity: low/medium/high + custom threshold
- Log channel, exempt roles/users
- Staff notifications, mute duration
Commands: [p]sbguard enable/disable/action/sensitivity/threshold/logchannel/scan/flagged/reset
Slash: /sbguard-status, /sbguard-scan
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