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/products/products.go

@@ -30,6 +30,8 @@ import (
 	"git.t5de.dev/t5de/t5de-api/cfl"
 	"git.t5de.dev/t5de/t5de-api/pack"
 	"git.t5de.dev/t5de/t5de-proxy/internal/hub"
+	"git.t5de.dev/t5de/t5de-proxy/internal/imq"
+	"git.t5de.dev/t5de/t5de-proxy/internal/proxy"
 )
 
 // Products is the proxy's community products: an Interceptor for HTTP and an IMQFilter for chat.
@@ -67,6 +69,11 @@ type Products struct {
 	// Library, if set, is the person's hub library as last read (for the inventory's Recently Added).
 	Library func() []hub.LibraryEntry
 
+	// Hosted, if set, serves T5DE-hosted rooms' queues (the hosted package); HostedOwner is the IMVU account owning
+	// the hosted room the client is in (0 if none), whose products the room's are.
+	Hosted      HostedRooms
+	HostedOwner func() int64
+
 	roomMu sync.Mutex
 	room   room
 
@@ -99,6 +106,26 @@ func (p *Products) Ready(id string) {
 	}
 }
 
+// HostedOwnerID is the user ID the client gives hosted rooms' owner: the first part of their instance IDs
+// (hosted.Base).
+const HostedOwnerID = 2100000000
+
+// HostedRooms serves T5DE-hosted rooms' IMQ queues: Route answers subscriptions to them, Send takes the client's
+// messages to them (reporting whether the queue was one), Closed forgets a connection.
+type HostedRooms interface {
+	Route(c *proxy.IMQConn, unsubscribe bool, s imq.Subscription) imq.Subscription
+	Send(queue, mount string, message []byte) bool
+	Closed(c *proxy.IMQConn)
+}
+
+// Route serves hosted rooms' queues (proxy.IMQRouter).
+func (p *Products) Route(c *proxy.IMQConn, unsubscribe bool, s imq.Subscription) imq.Subscription {
+	if p.Hosted == nil {
+		return s
+	}
+	return p.Hosted.Route(c, unsubscribe, s)
+}
+
 // Observer hears about the client's IMVU account, its community outfit, and the chats it's in.
 type Observer interface {
 	Session(imvuID int64)
@@ -371,3 +398,22 @@ func (p *Products) reportOutfit(user string, locals []int64) {
 	}
 	p.Observer.Outfit(id, items)
 }
+
+// LocalID is the client's local ID for a product (a hub product ID or a local pack's), if it's here.
+func (p *Products) LocalID(id string) (int64, bool) {
+	if s := p.byProductID(id); s != nil {
+		return s.local, true
+	}
+	return 0, false
+}
+
+// ProductID is the product a local ID was given to.
+func (p *Products) ProductID(local int64) (string, bool) { return p.state.productID(local) }
+
+// User is the IMVU account the client signed in as (0 before it has).
+func (p *Products) User() int64 {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	id, _ := strconv.ParseInt(p.user, 10, 64)
+	return id
+}