feat: Phase 7 — MeshCentral Remote Desktop Integration

Backend:
- MeshCentralOptions + MeshCentralService: Node-Lookup via Hostname, Remote-Desktop-URL-Generierung
- RemoteDesktopController: GET /api/v1/agents/{id}/remote-session mit 3 Status-Zuständen (nicht konfiguriert / Agent fehlt / bereit)
- Program.cs: HttpClient + MeshCentralService registriert, appsettings.json mit Konfigurationsblock

Go Agent:
- config.go: MeshCentralUrl + MeshEnabled Felder
- internal/meshagent/installer.go: MeshAgent Download + Installation (Windows Service / Linux systemd)
- main.go: Automatische MeshAgent-Installation nach Enrollment wenn aktiviert

Frontend:
- RemoteDesktopButton: Modales Dialog mit 3 Zustandsanzeigen (Setup nötig / Agent installieren / Remote Desktop öffnen)
- AgentDetailPage: RemoteDesktopButton im Header integriert
- api/types.ts + api/client.ts: RemoteSessionInfo Typ + remoteDesktopApi

docker-compose.yml: MeshCentral Service (ghcr.io/ylianst/meshcentral:latest, Ports 4430/4431)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Frontend/src/api/client.ts

@@ -14,6 +14,7 @@ import type {
   CreateSoftwarePackageRequest,
   DeployRequest,
   DeployResponse,
+  RemoteSessionInfo,
 } from './types'
 
 const BASE_URL = '/api/v1'
@@ -97,3 +98,9 @@ export const deployApi = {
   deploy: (data: DeployRequest) =>
     request<DeployResponse>('/deploy', { method: 'POST', body: JSON.stringify(data) }),
 }
+
+// Remote Desktop
+export const remoteDesktopApi = {
+  getSession: (agentId: string) =>
+    request<RemoteSessionInfo>(`/agents/${agentId}/remote-session`),
+}

Frontend/src/api/types.ts

@@ -173,3 +173,14 @@ export interface DeployResponse {
   packageName: string
   version: string
 }
+
+export interface RemoteSessionInfo {
+  configured: boolean
+  agentInstalled?: boolean
+  message?: string
+  setupUrl?: string
+  meshAgentDownloadUrl?: string
+  meshNodeId?: string
+  sessionUrl?: string
+  meshCentralBaseUrl?: string
+}