PvPIndex MCBans

Added

• VPN detection - AntVPN WebSocket integration (wss://api.antivpn.io/connect). Configured via antivpn.yml (disabled by default). Supports WARN, KICK, and BAN actions on detection. BAN action stores a local ban record. Exponential backoff reconnect (1 s to 30 s cap). mcbans.vpn.bypass permission (default: op) lets trusted players skip the check.
• Legacy ban import - On player join the plugin queries mcbans.com/api/v2/player/{uuid} and caches any found ban as an is_legacy local record. Subsequent joins skip the network call. Controlled by the new pvpindex.legacy config section (enabled, check-on-join, include-in-bans - all default true).
• Public kicks - New pvpindex.kicks.public config flag (default false). When enabled, every /kick is posted to the PvPIndex API and shown on bans.pvpindex.com.
• KickRecord and KickRequest DTOs in pvpindex-mcbans-api - other plugins using the JitPack client can now retrieve and submit kicks.
• Config bumped to ConfigVersion: 4; upgrading servers get their old config backed up automatically.