feat: 添加同步进度显示和中文界面支持

refactor: 重构同步引擎以支持进度跟踪
style: 更新前端界面为中文
docs: 更新README为中文文档

internal/handler/server.go

@@ -229,10 +229,7 @@ func HandleGetSyncStatus(engine *sync.Engine) gin.HandlerFunc {
 			c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid server ID"})
 			return
 		}
-		status := "idle"
-		if engine.IsSyncing(id) {
-			status = "syncing"
-		}
-		c.JSON(http.StatusOK, gin.H{"server_id": id, "status": status})
+		progress := engine.GetProgress(id)
+		c.JSON(http.StatusOK, progress)
 	}
 }