Add private messaging system and restore direct-message logging

[benrobson]

Motivation

• Provide an in-proxy private messaging system with /message//msg and /reply so players can DM each other.
• Allow users to manage inbound messages via an ignore list and a toggle and persist those preferences across restarts.
• Integrate messaging into the plugin lifecycle and keep a name cache for UUID↔name resolution on login via updateNameCache.
• Re-enable sending the full direct-message contents to the command/social spy API instead of redacting them.

Description

• Added PrivateMessageService that persists messagesDisabled, ignoreList, and nameCache to private-messages.json and maintains an in-memory lastConversation map.
• Implemented and registered commands: message (aliases m,msg,w,whisper,tell,t), reply (r), ignore (add/remove/list), and togglemessages and wired them into ZanderVelocityMain.
• Wired the service into ZanderVelocityMain (data directory injection and privateMessageService exposure) and updated UserOnLogin to call PrivateMessageService.updateNameCache on player login.
• Restored direct-message contents in UserCommandSpyEvent and UserSocialSpyEvent by removing the redaction logic so the full message text is logged and sent to the spy API.

Testing

• No automated tests were run for these changes.

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Codex Task

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