Nightly Build - may be unstable.\n\nCommit: e53b2ee2eae918c3844a41ba7a3804da65a558d7\n\nfeat(clients): add LabyMod 4 Server API integration with Discord RPC

• Add LabyModBridge with full LabyMod 4 Server API support
• Implement Discord Rich Presence integration for lobby and in-game states
• Add economy display widget for player balance tracking
• Implement permission-based feature toggles for LabyMod addons
• Add addon blacklist/whitelist configuration system
• Integrate LabyMod player join/quit lifecycle management
• Add LabyMod configuration files (config.yml, addons.yml)
• Add LabyMod Server API dependency to pom.xml
• Update main plugin lifecycle to initialize and reload LabyModBridge
• Remove redundant Feather UI disabled log message
• Gracefully handle missing LabyMod Server API plugin with no-op fallback