chatto client: fix Connect JSON field names (camelCase, nested room), verify against live server

internal/chatto/client.go

@@ -112,10 +112,14 @@ type Room struct {
 	Name        string `json:"name"`
 	Description string `json:"description,omitempty"`
 	Archived    bool   `json:"archived,omitempty"`
-	GroupID     string `json:"group_id,omitempty"`
+	GroupID     string `json:"groupId,omitempty"`
 	Universal   bool   `json:"universal,omitempty"`
 }
 
+type roomWithViewerState struct {
+	Room Room `json:"room"`
+}
+
 type listRoomsRequest struct {
 	Page *pageRequest `json:"page,omitempty"`
 }
@@ -125,40 +129,44 @@ type pageRequest struct {
 }
 
 type listRoomsResponse struct {
-	Rooms []Room `json:"rooms"`
+	Rooms []roomWithViewerState `json:"rooms"`
 	Page  struct {
-		TotalCount int64 `json:"total_count"`
-		HasMore    bool  `json:"has_more"`
+		TotalCount int64 `json:"totalCount,string"`
+		HasMore    bool  `json:"hasMore"`
 	} `json:"page"`
 }
 
 // ListRooms returns rooms visible to the token's user (single page, up to 100).
 func (c *Client) ListRooms(ctx context.Context) ([]Room, error) {
-	resp, err := call[struct{}, listRoomsResponse](ctx, c,
-		"RoomDirectoryService", "ListRooms", &struct{}{})
+	resp, err := call[listRoomsRequest, listRoomsResponse](ctx, c,
+		"RoomDirectoryService", "ListRooms", &listRoomsRequest{Page: &pageRequest{PageSize: 100}})
 	if err != nil {
 		return nil, err
 	}
-	return resp.Rooms, nil
+	rooms := make([]Room, 0, len(resp.Rooms))
+	for _, rw := range resp.Rooms {
+		rooms = append(rooms, rw.Room)
+	}
+	return rooms, nil
 }
 
 // --- MessageService ---
 
 type Message struct {
-	EventID      string `json:"event_id"`
-	RoomID       string `json:"room_id"`
-	ThreadRoot   string `json:"thread_root_event_id,omitempty"`
-	AuthorUserID string `json:"author_user_id,omitempty"`
-	Body         string `json:"body,omitempty"`
-	CreatedAt    string `json:"created_at,omitempty"`
+	EventID    string `json:"id"`
+	RoomID     string `json:"roomId"`
+	ThreadRoot string `json:"threadRootEventId,omitempty"`
+	AuthorID   string `json:"actorId,omitempty"`
+	Body       string `json:"body,omitempty"`
+	CreatedAt  string `json:"createdAt,omitempty"`
 }
 
 type createMessageRequest struct {
-	RoomID            string `json:"room_id"`
+	RoomID            string `json:"roomId"`
 	Body              string `json:"body"`
-	ThreadRootEventID string `json:"thread_root_event_id,omitempty"`
-	InReplyTo         string `json:"in_reply_to,omitempty"`
-	AlsoSendToChannel bool   `json:"also_send_to_channel,omitempty"`
+	ThreadRootEventID string `json:"threadRootEventId,omitempty"`
+	InReplyTo         string `json:"inReplyTo,omitempty"`
+	AlsoSendToChannel bool   `json:"alsoSendToChannel,omitempty"`
 }
 
 type createMessageResponse struct {
@@ -181,8 +189,8 @@ func (c *Client) CreateMessage(ctx context.Context, roomID, body string, threadR
 }
 
 type getMessageRequest struct {
-	RoomID  string `json:"room_id"`
-	EventID string `json:"event_id"`
+	RoomID  string `json:"roomId"`
+	EventID string `json:"eventId"`
 }
 
 type getMessageResponse struct {