feat: Workspace-Umbau Schritt 3 — Backend-Kanaele + code/desktop-Services

Verdrahtet die neuen Kanaele "dunkel" (noch ohne UI):
- rvs/server.js: ALLOWED_TYPES um code_file/code_file_edit, check_desktop/
  desktop_status und vnc_open/close/data/input erweitert (Base64-in-JSON-Relay
  wie audio_pcm, kein Binaer-Handling noetig).
- brainApi.ts: Project.kind ('code'|'chat') + desktop_url; ChatScreen publiziert
  die Kinds in den projectFocus-Spiegel.
- services/codeFile.ts: Live-Spiegel der Code-Dateien (content + Deltas) mit
  Ruckkanal code_file_edit fuer eigene Edits.
- services/desktop.ts: Desktop-Status + VNC-RFB-Tunnel (vnc_open/close/input/
  data) durch RVS, Session = Projekt-ID.

tsc clean, rvs/server.js syntaktisch OK.

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

android/src/screens/ChatScreen.tsx

@@ -526,8 +526,13 @@ const ChatScreen: React.FC = () => {
       brainApi.listProjects(true)
         .then(list => {
           const map: Record<string, string> = {};
-          for (const p of list) map[p.id] = p.name;
+          const kinds: Record<string, 'code' | 'chat'> = {};
+          for (const p of list) {
+            map[p.id] = p.name;
+            kinds[p.id] = p.kind === 'code' ? 'code' : 'chat';
+          }
           setProjectNameById(prev => ({ ...prev, ...map }));
+          projectFocus.setKinds(kinds);
         })
         .catch(() => {});
     };

android/src/services/brainApi.ts

@@ -162,6 +162,12 @@ export interface Project {
   updated_at: number;
   last_activity_at: number;
   turn_count: number;
+  // Workspace: 'code' blendet Editor-/VNC-Kacheln ein. ARIA setzt das selbst
+  // via set_project_kind; fehlt/undefined = 'chat' (nur Chat-Kachel).
+  kind?: 'code' | 'chat';
+  // Optionale absolute noVNC-URL (falls der Desktop direkt erreichbar ist,
+  // sonst laeuft der VNC-Stream als RFB-Bytes durch RVS).
+  desktop_url?: string;
 }
 
 export interface ProjectStatus {

android/src/services/desktop.ts

@@ -0,0 +1,102 @@
+/**
+ * desktop — Desktop-/VNC-Anbindung fuer Code-Projekte.
+ *
+ * Zwei Aufgaben:
+ *  1. Verfuegbarkeit: `check_desktop` triggert die Bridge, `desktop_status`
+ *     meldet zurueck ob eine QEMU-VNC laeuft (und ggf. eine direkte URL).
+ *  2. VNC-Tunnel: der noVNC-Client in der App-WebView spricht kein eigenes
+ *     WebSocket, sondern schickt RFB-Bytes als `vnc_input` (Base64) ueber RVS;
+ *     die Bridge oeffnet die TCP-Verbindung zu QEMU (host:5901) und streamt die
+ *     Antwort als `vnc_data` zurueck. Base64-in-JSON wie audio_pcm.
+ *
+ * Eine Session = ein Desktop; wir nutzen die Projekt-ID als Session-Key (leer =
+ * 'main'). Muster wie services/rvs.ts (Singleton mit Listener-Listen).
+ */
+
+import rvs, { RVSMessage } from './rvs';
+
+export interface DesktopStatus {
+  available: boolean;
+  session: string;
+  /** optionale direkte noVNC-URL (falls Host direkt erreichbar) */
+  url?: string;
+  message?: string;
+}
+
+type StatusSub = (s: DesktopStatus) => void;
+type VncDataSub = (b64: string) => void;
+
+const DEFAULT_VNC_PORT = 5901;
+const sessionOf = (projectId: string) => projectId || 'main';
+
+class DesktopService {
+  private status: DesktopStatus = { available: false, session: '' };
+  private statusSubs: StatusSub[] = [];
+  private vncDataSubs: VncDataSub[] = [];
+  private currentSession = '';
+
+  constructor() {
+    rvs.onMessage((m) => this.onMessage(m));
+  }
+
+  private onMessage(m: RVSMessage): void {
+    const p = (m.payload || {}) as any;
+    if (m.type === 'desktop_status') {
+      this.status = {
+        available: !!p.available,
+        session: p.session || '',
+        url: typeof p.url === 'string' ? p.url : undefined,
+        message: p.message,
+      };
+      const s = this.status;
+      this.statusSubs.forEach((cb) => cb(s));
+    } else if (m.type === 'vnc_data') {
+      if (this.currentSession && p.session && p.session !== this.currentSession) return;
+      const b64 = typeof p.b64 === 'string' ? p.b64 : '';
+      if (b64) this.vncDataSubs.forEach((cb) => cb(b64));
+    }
+  }
+
+  getStatus(): DesktopStatus {
+    return this.status;
+  }
+
+  subscribeStatus(cb: StatusSub): () => void {
+    this.statusSubs.push(cb);
+    cb(this.status);
+    return () => { this.statusSubs = this.statusSubs.filter((s) => s !== cb); };
+  }
+
+  /** Bridge fragen, ob fuer dieses Projekt ein QEMU-Desktop laeuft. */
+  requestCheck(projectId: string, port: number = DEFAULT_VNC_PORT): void {
+    rvs.send('check_desktop', { projectId: projectId || '', session: sessionOf(projectId), port });
+  }
+
+  /** VNC-Tunnel oeffnen — Bridge verbindet TCP zu QEMU. */
+  openVnc(projectId: string, port: number = DEFAULT_VNC_PORT): string {
+    const session = sessionOf(projectId);
+    this.currentSession = session;
+    rvs.send('vnc_open', { session, port });
+    return session;
+  }
+
+  closeVnc(): void {
+    if (this.currentSession) rvs.send('vnc_close', { session: this.currentSession });
+    this.currentSession = '';
+  }
+
+  /** RFB-Bytes (Base64) aus der noVNC-WebView an die Bridge weiterreichen. */
+  sendInput(b64: string): void {
+    if (!this.currentSession) return;
+    rvs.send('vnc_input', { session: this.currentSession, b64 });
+  }
+
+  /** Listener fuer eingehende RFB-Bytes (Base64) — die noVNC-WebView. */
+  onVncData(cb: VncDataSub): () => void {
+    this.vncDataSubs.push(cb);
+    return () => { this.vncDataSubs = this.vncDataSubs.filter((s) => s !== cb); };
+  }
+}
+
+const desktop = new DesktopService();
+export default desktop;