chore: update project structure and enhance plugin functionality

- Added new entries to .gitignore for database files.
- Updated go.mod and go.sum to include new indirect dependencies for database and ORM support.
- Refactored event handling to improve message reply functionality in the protocol.
- Enhanced the dispatcher to allow for better event processing and logging.
- Removed outdated plugin documentation and unnecessary files to streamline the codebase.
- Improved welcome message formatting and screenshot options for better user experience.

internal/plugins/echo/echo_new.go

@@ -2,6 +2,7 @@ package echo
 
 import (
 	"context"
+	"strings"
 
 	"cellbot/internal/engine"
 	"cellbot/internal/protocol"
@@ -10,56 +11,27 @@ import (
 )
 
 func init() {
-	// 在 init 函数中注册多个处理函数（类似 ZeroBot 风格）
-
-	// 处理私聊消息（使用 OnlyPrivate 中间件，虽然 OnPrivateMessage 已经匹配私聊，这里作为示例）
-	engine.OnPrivateMessage().
-		Use(engine.OnlyPrivate()). // 只在私聊中响应
+	// 注册 /echo 命令
+	engine.OnCommand("/echo").
 		Handle(func(ctx context.Context, event protocol.Event, botManager *protocol.BotManager, logger *zap.Logger) error {
 			// 获取消息内容
 			data := event.GetData()
-			message, ok := data["message"]
+			rawMessage, ok := data["raw_message"].(string)
 			if !ok {
 				return nil
 			}
 
-			userID, ok := data["user_id"]
-			if !ok {
-				return nil
+			// 解析命令参数（/echo 后面的内容）
+			parts := strings.Fields(rawMessage)
+			if len(parts) < 2 {
+				// 如果没有参数，返回提示
+				return event.ReplyText(ctx, botManager, logger, "用法: /echo <消息内容>")
 			}
 
-			// 获取 bot 实例
-			selfID := event.GetSelfID()
-			bot, ok := botManager.Get(selfID)
-			if !ok {
-				bots := botManager.GetAll()
-				if len(bots) == 0 {
-					logger.Error("No bot instance available")
-					return nil
-				}
-				bot = bots[0]
-			}
+			// 获取要回显的内容
+			echoContent := strings.Join(parts[1:], " ")
 
-			// 发送回复
-			action := &protocol.BaseAction{
-				Type: protocol.ActionTypeSendPrivateMessage,
-				Params: map[string]interface{}{
-					"user_id": userID,
-					"message": message,
-				},
-			}
-
-			_, err := bot.SendAction(ctx, action)
-			if err != nil {
-				logger.Error("Failed to send reply", zap.Error(err))
-				return err
-			}
-
-			logger.Info("Echo reply sent", zap.Any("user_id", userID))
-			return nil
+			// 使用 ReplyText 发送回复
+			return event.ReplyText(ctx, botManager, logger, echoContent)
 		})
-
-	// 可以继续注册更多处理函数
-	// engine.OnGroupMessage().Handle(...)
-	// engine.OnCommand("help").Handle(...)
 }