feat: add teleport

crates/chattyness-db/src/ws_messages.rs

@@ -76,6 +76,12 @@ pub enum ClientMessage {
 
     /// Request to broadcast avatar appearance to other users.
     SyncAvatar,
+
+    /// Request to teleport to a different scene.
+    Teleport {
+        /// Scene ID to teleport to.
+        scene_id: Uuid,
+    },
 }
 
 /// Server-to-client WebSocket messages.
@@ -212,4 +218,12 @@ pub enum ServerMessage {
         /// Updated avatar render data.
         avatar: AvatarRenderData,
     },
+
+    /// Teleport approved - client should disconnect and reconnect to new scene.
+    TeleportApproved {
+        /// Scene ID to navigate to.
+        scene_id: Uuid,
+        /// Scene slug for URL.
+        scene_slug: String,
+    },
 }