Room channel: other T5DE users' community products on their avatars

The proxy follows the client's IMQ chat subscriptions and tells the hub which chats it's in (and the room, from
chat.getOrMakeChat). For the other T5DE users the hub says are in a chat, it gives the client the community
products it has packs for, as *use and *remove lines from them, and adds them to the whole outfits they send.
It also takes community products out of the outfit the client posts to IMVU's chat participant endpoint, which
had been sending them to IMVU.

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

internal/products/products.go

@@ -44,15 +44,20 @@ type Products struct {
 	byID     map[string]*served
 	problems map[string]string // pack directory -> last error logged
 
-	// Observer, if set, hears which IMVU account the client signs in as and the community products it wears (the
-	// hub client).
+	// Observer, if set, hears which IMVU account the client signs in as, the community products it wears, and the
+	// chats it's in (the hub client).
 	Observer Observer
+
+	roomMu sync.Mutex
+	room   room
 }
 
-// Observer hears about the client's IMVU account and its community outfit.
+// Observer hears about the client's IMVU account, its community outfit, and the chats it's in.
 type Observer interface {
 	Session(imvuID int64)
 	Outfit(imvuID int64, items []hub.Item)
+	Join(chat, room string)
+	Leave(chat string)
 }
 
 // served is a pack ready to serve.
@@ -305,7 +310,7 @@ func (p *Products) reportOutfit(user string, locals []int64) {
 	items := []hub.Item{}
 	for _, local := range locals {
 		if s := p.lookup(local); s != nil {
-			items = append(items, hub.Item{ID: s.pack.Manifest.ID, Name: s.pack.Manifest.Name})
+			items = append(items, hub.Item{ID: s.pack.Manifest.ID, Name: s.pack.Manifest.Name, Adult: s.pack.Manifest.Rating == "adult"})
 		}
 	}
 	p.Observer.Outfit(id, items)