feat(cross-platform): 添加跨平台功能支持及配置优化

- 新增跨平台配置模型和全局配置支持
- 优化 Discord 适配器的连接管理和错误处理
- 添加 watchdog 和 discord.py 依赖
- 创建 DeepSeek API 配置文档
- 移除重复的同步帮助图片代码
- 改进跨平台插件配置加载逻辑

core/config_loader.py

@@ -7,7 +7,7 @@ from pathlib import Path
 
 import tomllib
 from pydantic import ValidationError
-from .config_models import ConfigModel, NapCatWSModel, BotModel, RedisModel, DockerModel, ImageManagerModel, MySQLModel, ReverseWSModel, ThreadingModel, BilibiliModel, LocalFileServerModel, DiscordModel, LoggingModel
+from .config_models import ConfigModel, NapCatWSModel, BotModel, RedisModel, DockerModel, ImageManagerModel, MySQLModel, ReverseWSModel, ThreadingModel, BilibiliModel, LocalFileServerModel, DiscordModel, CrossPlatformModel, LoggingModel
 from .utils.logger import ModuleLogger
 from .utils.exceptions import ConfigError, ConfigNotFoundError, ConfigValidationError
 
@@ -164,6 +164,13 @@ class Config:
         """
         return self._model.discord
     
+    @property
+    def cross_platform(self) -> CrossPlatformModel:
+        """
+        获取跨平台配置
+        """
+        return self._model.cross_platform
+    
     @property
     def logging(self) -> LoggingModel:
         """