fix(singbox): remove incorrect transport config for tcp in singbox

Author: x0sina

app/subscription/singbox.py

@@ -29,7 +29,6 @@ def __init__(self):
             "httpupgrade": self._transport_httpupgrade,
             "h2": self._transport_http,
             "h3": self._transport_http,
-            "tcp": self._transport_http,
             "raw": self._transport_http,
         }
 
@@ -167,6 +166,10 @@ def _apply_transport(self, network: str, inbound: SubscriptionInboundData, path:
         if network in ("tcp", "raw") and getattr(inbound.transport_config, "header_type", "none") == "http":
             network = "http"
 
+        # For pure TCP connections without HTTP headers, don't add transport config
+        if network in ("tcp", "raw") and getattr(inbound.transport_config, "header_type", "none") != "http":
+            return None
+
         handler = self.transport_handlers.get(network)
         if not handler:
             return None