refactor(compute): remove SPICE WebSocket console support

Remove all SPICE WebSocket-related code due to frontend dependency issues
with spice-html5 library (missing RSAKey/BigInteger implementations).

Changes:
- Remove start_spice_websocket_console() from BaseNode
- Remove SPICE WebSocket endpoints from QEMU and Docker compute APIs
- Remove SPICE WebSocket proxy endpoint from controller API
- Remove WebSocket subprotocol handling from authentication layers
- Remove SPICE documentation

The SPICE console type remains functional for direct connections,
but WebSocket proxy support has been removed.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

gns3server/api/routes/controller/nodes.py

@@ -721,81 +721,6 @@ async def vnc_console(
     except aiohttp.ClientError as e:
         log.error(f"Client error received when forwarding to compute VNC console WebSocket: {e}")
 
-@router.websocket("/{node_id}/console/spice")
-async def spice_console(
-        websocket: WebSocket,
-        current_user: schemas.User = Depends(has_privilege_on_websocket("Node.Console")),
-        node: Node = Depends(dep_node)
-) -> None:
-    """
-    SPICE WebSocket console.
-
-    Required privilege: Node.Console
-    """
-
-    if current_user is None:
-        return
-
-    compute = node.compute
-    log.info(
-        f"New client {websocket.client.host}:{websocket.client.port} has connected to controller SPICE console WebSocket"
-    )
-
-    compute_host = compute.host
-    try:
-        # handle IPv6 address
-        ip = ipaddress.ip_address(compute_host)
-        if isinstance(ip, ipaddress.IPv6Address):
-            compute_host = '[' + compute_host + ']'
-    except ValueError:
-        pass
-
-    spice_console_compute_url = (
-        f"{websocket.url.scheme}://{compute_host}:{compute.port}/v3/compute/projects/"
-        f"{node.project.id}/{node.node_type}/nodes/{node.id}/console/spice"
-    )
-
-    async def spice_receive(spice_console_compute):
-        """
-        Receive binary WebSocket data from client and forward to compute SPICE console WebSocket.
-        """
-
-        try:
-            while True:
-                data = await websocket.receive_bytes()
-                if data:
-                    await spice_console_compute.send_bytes(data)
-        except WebSocketDisconnect:
-            await spice_console_compute.close()
-            log.info(
-                f"Client {websocket.client.host}:{websocket.client.port} has disconnected from controller"
-                f" SPICE console WebSocket"
-            )
-
-    try:
-        # receive binary data from compute SPICE console WebSocket and forward to client
-        log.info(f"Forwarding SPICE console WebSocket to '{spice_console_compute_url}'")
-        server_config = Config.instance().settings.Server
-        user = server_config.compute_username
-        password = server_config.compute_password
-        if not user:
-            raise ControllerForbiddenError("Compute username is not set")
-        user = user.strip()
-        if user and password:
-            auth = aiohttp.BasicAuth(user, password.get_secret_value(), "utf-8")
-        else:
-            auth = aiohttp.BasicAuth(user, "")
-        ssl_context = Controller.instance().ssl_context()
-        async with HTTPClient.get_client().ws_connect(spice_console_compute_url, auth=auth, ssl_context=ssl_context) as ws:
-            asyncio.ensure_future(spice_receive(ws))
-            async for msg in ws:
-                if msg.type == aiohttp.WSMsgType.BINARY:
-                    await websocket.send_bytes(msg.data)
-                elif msg.type == aiohttp.WSMsgType.ERROR:
-                    break
-    except aiohttp.ClientError as e:
-        log.error(f"Client error received when forwarding to compute SPICE console WebSocket: {e}")
-
 @router.post(
     "/console/reset",
     status_code=status.HTTP_204_NO_CONTENT,