Fix #3422: 1.21.11: How to match Velocity command?

[kangobot]

Automated fix proposed by AI analysis of the linked issue.

Changes

• New: main/chatcontrol-proxy-core/src/main/java/org/mineacademy/chatcontrol/proxy/operator/ProxyRule.java: New class for proxy-level command rules matching. Extends ProxyOperator to inherit all operators (then deny, then warn, then command, then proxy, etc.). Adds regex pattern matching, sender conditions, and a RuleCheck inner class that processes rules against proxy commands.
• New: main/chatcontrol-proxy-core/src/main/java/org/mineacademy/chatcontrol/proxy/operator/ProxyRules.java: New class that manages proxy command rules. Extends RuleSetReader with keyword "match", loads from rules/command.rs. Mirrors ProxyPlayerMessages structure but for regex-based command rules.
• New: main/chatcontrol-proxy-core/src/main/resources/rules/command.rs: Default proxy command rules file. All rules are commented out by default, providing examples for users to customize. This file is extracted by RuleSetReader.loadFromFile() on first run.
• main/chatcontrol-proxy-core/src/main/java/org/mineacademy/chatcontrol/proxy/ProxyEvents.java: Add import for ProxyRule
• main/chatcontrol-proxy-core/src/main/java/org/mineacademy/chatcontrol/proxy/ProxyEvents.java: Add EventHandledException import for handleCommand method
• main/chatcontrol-proxy-core/src/main/java/org/mineacademy/chatcontrol/proxy/ProxyEvents.java: Add handleCommand method that runs proxy command rules against the executed command and returns true if the command should be cancelled
• main/chatcontrol-velocity/src/main/java/org/mineacademy/chatcontrol/velocity/listener/PlayerListener.java: Add import for CommandExecuteEvent
• main/chatcontrol-velocity/src/main/java/org/mineacademy/chatcontrol/velocity/listener/PlayerListener.java: Add Player import for command event handler type check
• main/chatcontrol-velocity/src/main/java/org/mineacademy/chatcontrol/velocity/listener/PlayerListener.java: Add command event handler that checks proxy command rules and denies if a rule matches with 'then deny'
• main/chatcontrol-bungeecord/src/main/java/org/mineacademy/chatcontrol/bungee/listener/PlayerListener.java: Extend the BungeeCord ChatEvent handler to also handle proxy command rules when the event is a command. Routes commands to ProxyEvents.handleCommand() and cancels the event if denied.
• main/chatcontrol-velocity/src/main/java/org/mineacademy/chatcontrol/velocity/VelocityControl.java: Add ProxyRules import
• main/chatcontrol-velocity/src/main/java/org/mineacademy/chatcontrol/velocity/VelocityControl.java: Load proxy command rules on plugin reload
• main/chatcontrol-bungeecord/src/main/java/org/mineacademy/chatcontrol/bungee/BungeeControl.java: Add ProxyRules import
• main/chatcontrol-bungeecord/src/main/java/org/mineacademy/chatcontrol/bungee/BungeeControl.java: Load proxy command rules on plugin reload
• main/chatcontrol-proxy-core/src/main/java/org/mineacademy/chatcontrol/proxy/operator/ProxyRule.java: Add $0, $1, $2 regex group reference support to match Bukkit rules syntax. Replace from highest group number down to avoid $1 replacing part of $10.
• main/chatcontrol-proxy-core/src/main/java/org/mineacademy/chatcontrol/proxy/operator/ProxyRule.java: Add @nonnull annotation to match parent method signature for consistency
• main/chatcontrol-proxy-core/src/main/java/org/mineacademy/chatcontrol/proxy/operator/ProxyRule.java: Add NonNull import for the replaceVariablesLegacy override annotation

This is a draft PR — human review required before merging.

[devpedrobarbosa]

@kangarko

I'll have to test this one out before we can push it, will do it by today.