Replace websocket flow with SSE support in backend.

Update handlers, services, router, and data conversion logic to support server-sent events and related message pipeline changes.

Made-with: Cursor

internal/middleware/cors.go

@@ -1,18 +1,10 @@
 package middleware
 
-import (
-	"log"
-	"strings"
-
-	"github.com/gin-gonic/gin"
-)
+import "github.com/gin-gonic/gin"
 
 // CORS CORS中间件
 func CORS() gin.HandlerFunc {
 	return func(c *gin.Context) {
-		// 获取请求路径
-		path := c.Request.URL.Path
-
 		c.Header("Access-Control-Allow-Origin", "*")
 		c.Header("Access-Control-Allow-Methods", "GET, POST, PUT, PATCH, DELETE, OPTIONS")
 		// 添加 WebSocket 升级所需的头
@@ -22,25 +14,10 @@ func CORS() gin.HandlerFunc {
 
 		// 处理 WebSocket 升级请求的预检
 		if c.Request.Method == "OPTIONS" {
-			log.Printf("[CORS] OPTIONS 预检请求: %s", path)
 			c.AbortWithStatus(204)
 			return
 		}
 
-		// 针对 WebSocket 路径的特殊处理
-		if path == "/ws" {
-			connection := c.GetHeader("Connection")
-			upgrade := c.GetHeader("Upgrade")
-			log.Printf("[CORS] WebSocket 请求: Connection=%s, Upgrade=%s", connection, upgrade)
-
-			// 检查是否是有效的 WebSocket 升级请求
-			if strings.Contains(strings.ToLower(connection), "upgrade") && strings.ToLower(upgrade) == "websocket" {
-				log.Printf("[CORS] 有效的 WebSocket 升级请求")
-			} else {
-				log.Printf("[CORS] 警告: 不是有效的 WebSocket 升级请求!")
-			}
-		}
-
 		c.Next()
 	}
 }