Add HuaJiBot.NET.Adapter.Kook with Kook.Net integration

[Copilot]

This PR implements a new adapter for the Kook platform (formerly KaiHeiLa) using the official @gehongyan/Kook.Net library, enabling HuaJiBot.NET to connect to and interact with Kook servers.

Changes Made

New Adapter Implementation

• HuaJiBot.NET.Adapter.Kook: Complete new project implementing the Kook adapter
• KookAdapter.cs: Main adapter class inheriting from BotServiceBase with full implementation of all required methods
• KookCommandReader.cs: Message parser handling Kook's KMarkdown format, mentions, and replies

Core Integration

• Configuration Support: Added ServiceType.Kook and KookConnectionInfo to the config system
• CLI Integration: Updated App.cs to support Kook adapter initialization
• Solution Integration: Added new project to solution file with proper dependencies

Features Implemented

• Bot login and connection management using Kook.Net WebSocket client
• Message receiving and event processing integrated with HuaJiBot.NET's event system
• Text message sending with support for mentions using Kook's (met)userId(met) format
• Message recall functionality
• Channel name modification
• Proper command parsing supporting text, mentions, and message replies
• Error handling and logging throughout

Technical Details

The implementation follows the established patterns of existing adapters (OneBot, Satori):

// Configuration example
{
  "Service": "Kook",
  "Kook": {
    "Token": "your_kook_bot_token"
  }
}

// Usage follows standard pattern
var adapter = new KookAdapter(token) { Logger = logger };
await adapter.SetupServiceAsync();

The adapter properly integrates with the plugin system and supports all standard HuaJiBot.NET functionality including command processing, event handling, and plugin data management.

Dependencies

• Kook.Net (version 0.0.45-alpha): Official Kook .NET library by @gehongyan
• Compatible with the existing HuaJiBot.NET framework architecture

This implementation provides a solid foundation for Kook platform support and can be extended with additional features like rich embeds, voice channels, and advanced permission handling in the future.

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