feat: VM-Liste pro Projekt (Desktop-Panel) — Start/Stop/Verbinden

- Brain: project_vms.py (Registry /shared/config/project_vms.json pro Projekt) +
  Endpoints GET/POST/DELETE /projects/<id>/vms + boot/stop (via SSH aria-wohnung
  aria-vm auf dem Host; Status aus `aria-vm list`).
- ARIA-Tools vm_register/vm_list (aufs Request-Projekt) + Seed-Regel: nach dem
  VM-Bau registrieren, damit sie in Stefans Desktop-Panel auftaucht.
- App: brainApi VM-Methoden + ProjectVm-Typ. Neues DesktopTile — pro Projekt die
  VM-Liste (leer bis registriert), Start/Stop/Verbinden; Verbinden oeffnet noVNC
  (VncTile mit dem VNC-Port der VM). Deck rendert DesktopTile statt VncTile.

py/tsc clean.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

android/src/workspace/WorkspaceDeck.tsx

@@ -16,7 +16,7 @@ import { useWorkspaceLayout } from './useWorkspaceLayout';
 import WorkspaceDock from './WorkspaceDock';
 import ChatTile from './tiles/ChatTile';
 import CodeEditorTile from './tiles/CodeEditorTile';
-import VncTile from './tiles/VncTile';
+import DesktopTile from './tiles/DesktopTile';
 
 interface Props {
   projectId: string;
@@ -58,7 +58,7 @@ const WorkspaceDeck: React.FC<Props> = ({ projectId, panels, badges }) => {
     switch (id) {
       case 'chat': return <ChatTile />;
       case 'editor': return <CodeEditorTile projectId={projectId} />;
-      case 'vnc': return <VncTile projectId={projectId} focused={active === 'vnc'} />;
+      case 'vnc': return <DesktopTile projectId={projectId} focused={active === 'vnc'} />;
       default: return null;
     }
   };