fix(nodes): bind form-encoded posts and skip node inbounds in central xray

The Node model only carried `json:` tags, so when the panel's axios
posted form-encoded bodies to /panel/api/nodes/add and /test, Gin's
form binder produced a zero-valued Node — empty Name, empty Address,
Port=0 — surfacing as "node name is required" and a probe URL of
"https://:0/...". Add `form:` tags so add/test bind correctly.

Also skip inbounds with NodeID set when building the central xray
config; otherwise the central panel tried to listen on ports owned by
node-managed inbounds and xray-core failed to start with a bind
collision.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/service/xray.go

@@ -113,6 +113,9 @@ func (s *XrayService) GetXrayConfig() (*xray.Config, error) {
 		if !inbound.Enable {
 			continue
 		}
+		if inbound.NodeID != nil {
+			continue
+		}
 		// get settings clients
 		settings := map[string]any{}
 		json.Unmarshal([]byte(inbound.Settings), &settings)