Serve T5DE-hosted rooms; a second client instance's own data

Hosted rooms (internal/hosted): room calls for them answered here, their IMQ queues served (a new
proxy.IMQRouter hook takes them out of subscriptions to IMVU), chat relayed through the hub's
WebSocket (hub.Client gains Send, OnRoom and OnConnect), the room list extended, room products
checked against the real owner, and anything else naming a hosted room kept from IMVU.

T5DE_INSTANCE gives a second client's proxy its own data folder and log.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

internal/imq/messages.go

@@ -9,6 +9,16 @@ const (
 	C2gSubscribe   = 1309
 	G2cResult      = 3102
 	G2cSendMessage = 3104
+	G2cStateChange = 3105
+	G2cJoinedQueue = 3106
+	G2cLeftQueue   = 3107
+	G2cCreateMount = 3108
+)
+
+// Mount types (G2cCreateMount).
+const (
+	MessageMount = 1
+	StateMount   = 2
 )
 
 // SendMessage is a C2gSendMessage: a message the client sends to a queue's mount.
@@ -202,3 +212,105 @@ func (m Delivered) Marshal() []byte {
 	}
 	return b
 }
+
+// QueueOp is a queue subscribed to with an operation ID, for a G2cResult.
+type QueueOp struct {
+	Queue string
+	OpID  uint64
+	raw   []byte // as the client sent it (with any other fields, such as properties)
+}
+
+// Subscription is a C2gSubscribe's or C2gUnsubscribe's data: queues listed plainly, and with operation IDs.
+type Subscription struct {
+	Queues      []string
+	WithResults []QueueOp
+}
+
+// ParseSubscriptionOps reads a C2gSubscribe's or C2gUnsubscribe's data, keeping operation IDs.
+func ParseSubscriptionOps(data []byte) (Subscription, error) {
+	fs, err := fields(data)
+	if err != nil {
+		return Subscription{}, err
+	}
+	var s Subscription
+	for _, f := range fs {
+		switch {
+		case f.num == 1 && f.isLen:
+			s.Queues = append(s.Queues, string(f.bytes))
+		case f.num == 2 && f.isLen:
+			sub, err := fields(f.bytes)
+			if err != nil {
+				return Subscription{}, err
+			}
+			q := QueueOp{raw: f.bytes}
+			for _, sf := range sub {
+				switch {
+				case sf.num == 1 && sf.isLen:
+					q.Queue = string(sf.bytes)
+				case sf.num == 2 && !sf.isLen:
+					q.OpID = sf.varint
+				}
+			}
+			s.WithResults = append(s.WithResults, q)
+		default:
+			return Subscription{}, errors.New("imq: unexpected field in a subscription")
+		}
+	}
+	return s, nil
+}
+
+// All is every queue in the subscription.
+func (s Subscription) All() []string {
+	out := append([]string(nil), s.Queues...)
+	for _, q := range s.WithResults {
+		out = append(out, q.Queue)
+	}
+	return out
+}
+
+// Empty reports whether it names no queues.
+func (s Subscription) Empty() bool { return len(s.Queues) == 0 && len(s.WithResults) == 0 }
+
+// Marshal encodes the subscription's data.
+func (s Subscription) Marshal() []byte {
+	var b []byte
+	for _, q := range s.Queues {
+		b = appendBytesField(b, 1, []byte(q))
+	}
+	for _, q := range s.WithResults {
+		raw := q.raw
+		if raw == nil {
+			raw = appendVarintField(appendBytesField(nil, 1, []byte(q.Queue)), 2, q.OpID)
+		}
+		b = appendBytesField(b, 2, raw)
+	}
+	return b
+}
+
+// Property is a mount's property: a key and a value.
+type Property struct{ Key, Value string }
+
+func appendProperties(b []byte, num uint64, props []Property) []byte {
+	for _, p := range props {
+		b = appendBytesField(b, num, appendBytesField(appendBytesField(nil, 1, []byte(p.Key)), 2, []byte(p.Value)))
+	}
+	return b
+}
+
+// JoinedQueue encodes a G2cJoinedQueue's (or G2cLeftQueue's) data: a user joined (left) a queue.
+func JoinedQueue(userID, queue string, sequence uint64) []byte {
+	return appendVarintField(appendBytesField(appendBytesField(nil, 1, []byte(userID)), 2, []byte(queue)), 3, sequence)
+}
+
+// CreateMount encodes a G2cCreateMount's data: a queue's mount, of type MessageMount or StateMount.
+func CreateMount(queue, mount string, mountType uint64, props []Property, sequence uint64) []byte {
+	b := appendVarintField(appendBytesField(appendBytesField(nil, 1, []byte(queue)), 2, []byte(mount)), 3, mountType)
+	return appendVarintField(appendProperties(b, 4, props), 5, sequence)
+}
+
+// StateChange encodes a G2cStateChange's data: a state mount's properties changed (an empty value removes one).
+func StateChange(opID uint64, userID, queue, mount string, props []Property, sequence uint64) []byte {
+	b := appendVarintField(nil, 1, opID)
+	b = appendBytesField(appendBytesField(appendBytesField(b, 2, []byte(userID)), 3, []byte(queue)), 4, []byte(mount))
+	return appendVarintField(appendProperties(b, 5, props), 6, sequence)
+}