feat(chat): implement sequence pre-allocation, versioned sync, and push worker

Introduce several performance and synchronization enhancements:
- Implement `SeqBufferManager` to allow sequence number pre-allocation via Redis Lua scripts, reducing atomic increment overhead.
- Add `PushWorker` to handle asynchronous message pushing using Redis Streams.
- Implement incremental conversation synchronization via `ConversationVersionLog` to allow clients to fetch only recent changes.
- Add support for Gzip compression in WebSocket communications to reduce bandwidth usage.
- Update dependency injection and configuration to support these new components.

internal/repository/conversation_version_log_repo.go

@@ -0,0 +1,58 @@
+package repository
+
+import (
+	"context"
+
+	"with_you/internal/model"
+
+	"gorm.io/gorm"
+)
+
+// ConversationVersionLogRepository 会话版本日志仓储接口
+type ConversationVersionLogRepository interface {
+	Create(ctx context.Context, log *model.ConversationVersionLog) error
+	BatchCreate(ctx context.Context, logs []*model.ConversationVersionLog) error
+	GetByVersion(ctx context.Context, userID string, sinceVersion int64, limit int) ([]*model.ConversationVersionLog, error)
+	GetMaxVersion(ctx context.Context, userID string) (int64, error)
+}
+
+// conversationVersionLogRepository GORM 实现
+type conversationVersionLogRepository struct {
+	db *gorm.DB
+}
+
+// NewConversationVersionLogRepository 创建会话版本日志仓储
+func NewConversationVersionLogRepository(db *gorm.DB) ConversationVersionLogRepository {
+	return &conversationVersionLogRepository{db: db}
+}
+
+func (r *conversationVersionLogRepository) Create(ctx context.Context, log *model.ConversationVersionLog) error {
+	return r.db.WithContext(ctx).Create(log).Error
+}
+
+func (r *conversationVersionLogRepository) BatchCreate(ctx context.Context, logs []*model.ConversationVersionLog) error {
+	if len(logs) == 0 {
+		return nil
+	}
+	return r.db.WithContext(ctx).CreateInBatches(logs, 100).Error
+}
+
+func (r *conversationVersionLogRepository) GetByVersion(ctx context.Context, userID string, sinceVersion int64, limit int) ([]*model.ConversationVersionLog, error) {
+	var logs []*model.ConversationVersionLog
+	err := r.db.WithContext(ctx).
+		Where("user_id = ? AND version > ?", userID, sinceVersion).
+		Order("version ASC").
+		Limit(limit).
+		Find(&logs).Error
+	return logs, err
+}
+
+func (r *conversationVersionLogRepository) GetMaxVersion(ctx context.Context, userID string) (int64, error) {
+	var maxVersion int64
+	err := r.db.WithContext(ctx).
+		Model(&model.ConversationVersionLog{}).
+		Where("user_id = ?", userID).
+		Select("COALESCE(MAX(version), 0)").
+		Scan(&maxVersion).Error
+	return maxVersion, err
+}