refactor: remove legacy spaces and migrate lists to standalone resources with direct sharing

internal/ws/hub.go

@@ -22,7 +22,7 @@ var upgrader = websocket.Upgrader{
 type Client struct {
 	hub     *Hub
 	conn    *websocket.Conn
-	spaceID string
+	roomID  string
 	userID  string
 	send    chan []byte
 }
@@ -37,7 +37,7 @@ type docLockItem struct {
 
 type Hub struct {
 	mu         sync.RWMutex
-	spaceRooms map[string]map[*Client]bool
+	rooms      map[string]map[*Client]bool
 	userRooms  map[string]map[*Client]bool
 	allClients map[*Client]bool
 	locks      map[string]*docLockItem
@@ -45,7 +45,7 @@ type Hub struct {
 
 func NewHub() *Hub {
 	h := &Hub{
-		spaceRooms: make(map[string]map[*Client]bool),
+		rooms:      make(map[string]map[*Client]bool),
 		userRooms:  make(map[string]map[*Client]bool),
 		allClients: make(map[*Client]bool),
 		locks:      make(map[string]*docLockItem),
@@ -57,11 +57,11 @@ func NewHub() *Hub {
 func (h *Hub) Register(c *Client) {
 	h.mu.Lock()
 	h.allClients[c] = true
-	if c.spaceID != "" {
-		if h.spaceRooms[c.spaceID] == nil {
-			h.spaceRooms[c.spaceID] = make(map[*Client]bool)
+	if c.roomID != "" {
+		if h.rooms[c.roomID] == nil {
+			h.rooms[c.roomID] = make(map[*Client]bool)
 		}
-		h.spaceRooms[c.spaceID][c] = true
+		h.rooms[c.roomID][c] = true
 	}
 	if c.userID != "" && c.userID != "anonymous" {
 		if h.userRooms[c.userID] == nil {
@@ -72,8 +72,8 @@ func (h *Hub) Register(c *Client) {
 	onlineCount := len(h.allClients)
 	h.mu.Unlock()
 
-	if c.spaceID != "" {
-		h.Broadcast(c.spaceID, "", "USER_PRESENCE", map[string]interface{}{
+	if c.roomID != "" {
+		h.Broadcast(c.roomID, "", "USER_PRESENCE", map[string]interface{}{
 			"onlineCount": onlineCount,
 		})
 	}
@@ -82,11 +82,11 @@ func (h *Hub) Register(c *Client) {
 func (h *Hub) Unregister(c *Client) {
 	h.mu.Lock()
 	delete(h.allClients, c)
-	if c.spaceID != "" {
-		if room, ok := h.spaceRooms[c.spaceID]; ok {
+	if c.roomID != "" {
+		if room, ok := h.rooms[c.roomID]; ok {
 			delete(room, c)
 			if len(room) == 0 {
-				delete(h.spaceRooms, c.spaceID)
+				delete(h.rooms, c.roomID)
 			}
 		}
 	}
@@ -297,7 +297,6 @@ func (h *Hub) BroadcastDocEvent(docID, event string, payload interface{}) {
 func (h *Hub) Broadcast(spaceID, listID, event string, payload interface{}) {
 	msg := domain.WSMessage{
 		Event:     event,
-		SpaceID:   spaceID,
 		ListID:    listID,
 		Payload:   payload,
 		Timestamp: domain.NowISO(),
@@ -310,20 +309,27 @@ func (h *Hub) Broadcast(spaceID, listID, event string, payload interface{}) {
 	h.mu.RLock()
 	defer h.mu.RUnlock()
 
-	room, ok := h.spaceRooms[spaceID]
-	if !ok {
-		return
+	targetRoom := listID
+	if targetRoom == "" {
+		targetRoom = spaceID
 	}
-	for client := range room {
-		select {
-		case client.send <- data:
-		default:
-			// Slow client buffer full
+
+	if room, ok := h.rooms[targetRoom]; ok {
+		for client := range room {
+			select {
+			case client.send <- data:
+			default:
+				// Slow client buffer full
+			}
 		}
 	}
 }
 
-func (h *Hub) ServeWS(w http.ResponseWriter, r *http.Request, spaceID, userID string) {
+func (h *Hub) BroadcastListEvent(listID, event string, payload interface{}) {
+	h.Broadcast("", listID, event, payload)
+}
+
+func (h *Hub) ServeWS(w http.ResponseWriter, r *http.Request, roomID, userID string) {
 	conn, err := upgrader.Upgrade(w, r, nil)
 	if err != nil {
 		log.Printf("[ws] upgrade error: %v", err)
@@ -333,7 +339,7 @@ func (h *Hub) ServeWS(w http.ResponseWriter, r *http.Request, spaceID, userID st
 	client := &Client{
 		hub:     h,
 		conn:    conn,
-		spaceID: spaceID,
+		roomID:  roomID,
 		userID:  userID,
 		send:    make(chan []byte, 128),
 	}