feat: enhance event handling and add scheduling capabilities

- Introduced a new scheduler to manage timed tasks within the event dispatcher.
- Updated the dispatcher to support the new scheduler, allowing for improved event processing.
- Enhanced action serialization in the OneBot11 adapter to convert message chains to the appropriate format.
- Added new dependencies for cron scheduling and other indirect packages in go.mod and go.sum.
- Improved logging for event publishing and handler matching, providing better insights during execution.
- Refactored plugin loading to include scheduled job management.

internal/protocol/message.go

@@ -0,0 +1,133 @@
+package protocol
+
+import "fmt"
+
+// MessageSegment 消息段（基于 OneBot12 设计）
+// 通用消息段结构，适配器负责转换为具体协议格式
+type MessageSegment struct {
+	Type string                 `json:"type"` // 消息段类型
+	Data map[string]interface{} `json:"data"` // 消息段数据
+}
+
+// MessageChain 消息链（基于 OneBot12 设计）
+// 消息由多个消息段组成
+type MessageChain []MessageSegment
+
+// 消息段类型常量（基于 OneBot12）
+const (
+	SegmentTypeText     = "text"     // 文本
+	SegmentTypeMention  = "mention"  // @提及（OneBot12）
+	SegmentTypeImage    = "image"    // 图片
+	SegmentTypeVoice    = "voice"    // 语音
+	SegmentTypeVideo    = "video"    // 视频
+	SegmentTypeFile     = "file"     // 文件
+	SegmentTypeLocation = "location" // 位置
+	SegmentTypeReply    = "reply"    // 回复
+	SegmentTypeForward  = "forward"  // 转发
+	SegmentTypeFace     = "face"     // 表情（QQ）
+	SegmentTypeAt       = "at"       // @提及（OneBot11 兼容）
+	SegmentTypeRecord   = "record"   // 语音（OneBot11 兼容）
+)
+
+// NewTextSegment 创建文本消息段
+func NewTextSegment(text string) MessageSegment {
+	return MessageSegment{
+		Type: SegmentTypeText,
+		Data: map[string]interface{}{
+			"text": text,
+		},
+	}
+}
+
+// NewMentionSegment 创建@提及消息段（OneBot12 标准）
+func NewMentionSegment(userID interface{}) MessageSegment {
+	return MessageSegment{
+		Type: SegmentTypeMention,
+		Data: map[string]interface{}{
+			"user_id": userID,
+		},
+	}
+}
+
+// NewImageSegment 创建图片消息段
+func NewImageSegment(fileID string) MessageSegment {
+	return MessageSegment{
+		Type: SegmentTypeImage,
+		Data: map[string]interface{}{
+			"file_id": fileID,
+		},
+	}
+}
+
+// NewImageSegmentFromBase64 从base64字符串创建图片消息段
+func NewImageSegmentFromBase64(base64Data string) MessageSegment {
+	return MessageSegment{
+		Type: SegmentTypeImage,
+		Data: map[string]interface{}{
+			"file": fmt.Sprintf("base64://%s", base64Data),
+		},
+	}
+}
+
+// NewReplySegment 创建回复消息段
+func NewReplySegment(messageID interface{}) MessageSegment {
+	return MessageSegment{
+		Type: SegmentTypeReply,
+		Data: map[string]interface{}{
+			"message_id": messageID,
+		},
+	}
+}
+
+// NewMessageChain 创建消息链
+func NewMessageChain(segments ...MessageSegment) MessageChain {
+	return MessageChain(segments)
+}
+
+// Append 追加消息段到消息链
+func (mc MessageChain) Append(segments ...MessageSegment) MessageChain {
+	return append(mc, segments...)
+}
+
+// AppendText 追加文本到消息链
+func (mc MessageChain) AppendText(text string) MessageChain {
+	return mc.Append(NewTextSegment(text))
+}
+
+// AppendMention 追加@提及到消息链
+func (mc MessageChain) AppendMention(userID interface{}) MessageChain {
+	return mc.Append(NewMentionSegment(userID))
+}
+
+// AppendImage 追加图片到消息链
+func (mc MessageChain) AppendImage(fileID string) MessageChain {
+	return mc.Append(NewImageSegment(fileID))
+}
+
+// AppendImageFromBase64 从base64追加图片到消息链
+func (mc MessageChain) AppendImageFromBase64(base64Data string) MessageChain {
+	return mc.Append(NewImageSegmentFromBase64(base64Data))
+}
+
+// ToString 将消息链转换为字符串（用于调试）
+func (mc MessageChain) ToString() string {
+	result := ""
+	for _, seg := range mc {
+		switch seg.Type {
+		case SegmentTypeText:
+			if text, ok := seg.Data["text"].(string); ok {
+				result += text
+			}
+		case SegmentTypeMention, SegmentTypeAt:
+			if userID, ok := seg.Data["user_id"]; ok {
+				result += fmt.Sprintf("@%v", userID)
+			} else if qq, ok := seg.Data["qq"]; ok {
+				// OneBot11 兼容
+				result += fmt.Sprintf("@%v", qq)
+			}
+		default:
+			result += fmt.Sprintf("[%s]", seg.Type)
+		}
+	}
+	return result
+}