Always include port in URL for protocols with raw TCP dial

Bubble protocol uses net.DialTimeout with u.Host directly,
which requires explicit port. Add portRequired set to force
port in generated URLs for such protocols.

pkg/camdb/streams.go

@@ -14,6 +14,11 @@ var defaultPorts = map[string]int{
 	"rtmp": 1935, "mms": 554, "rtp": 5004, "bubble": 80,
 }
 
+// protocols where port must always be explicit in URL (raw TCP dial without default port logic)
+var portRequired = map[string]bool{
+	"bubble": true,
+}
+
 type StreamParams struct {
 	IDs     string
 	IP      string
@@ -137,7 +142,7 @@ func buildURL(protocol, path, ip string, port int, user, pass string, channel in
 	}
 
 	host := ip
-	if p, ok := defaultPorts[protocol]; !ok || p != port {
+	if p, ok := defaultPorts[protocol]; (!ok || p != port) || portRequired[protocol] {
 		host = ip + ":" + strconv.Itoa(port)
 	}