fix(chat): 优化后台限流与 SSE 日志

backend/internal/middleware/request_logger.go

@@ -108,16 +108,25 @@ func isPaymentNotifyPath(path string) bool {
 }
 
 // shouldSkipHTTPLog 判断是否为无需记录的普通请求。
-func shouldSkipHTTPLog(_, _ string, status int, latencyMs float64) bool {
+func shouldSkipHTTPLog(path, route string, status int, latencyMs float64) bool {
 	if status >= 500 || status == http.StatusTooManyRequests {
 		return false
 	}
+	// SSE 的请求耗时就是连接存活时间，由 chathub 单独记录连接生命周期。
+	if isChatSSEPath(path, route) {
+		return true
+	}
 	if latencyMs >= slowRequestThresholdMs {
 		return false
 	}
 	return true
 }
 
+func isChatSSEPath(path, route string) bool {
+	return path == "/api/chats/events" || path == "/api/admin/chats/events" ||
+		route == "/api/chats/events" || route == "/api/admin/chats/events"
+}
+
 func meaningfulAuthFailure(c *gin.Context) bool {
 	value, ok := c.Get(ContextAuthFailureReason)
 	if !ok {