feat: board-first orchestration with Gateway Bridge, live-update, and flow-board

- GatewayBridgeController: MCP-artiger Kommando-Adapter für Agent-zu-Backend
- TaskBridgeService + LiveUpdateService: SSE Live-Sync + Bridge-Kommandos
- FlowBoard.vue: Board-first orchestration dashboard panel
- live-sync.ts store + live.ts service: SSE-basierte Live-Updates
- Nullability-Warnung in HealthController.cs gefixt
- nginx.conf: SSE-Proxy + CORS für Bridge-Endpunkte
- .gitignore: pnpm/corepack local caches ausgeschlossen
- docs: architecture-board-first-orchestration.md hinzugefügt
- README: Backend Bridge API dokumentiert

frontend/src/views/TaskDetailView.vue

@@ -169,6 +169,13 @@ function progressHint(taskLike: Pick<TaskDto, 'id' | 'lastActivityMessage' | 'ex
   return taskLike.lastActivityMessage?.trim() || childStatusSummary(taskLike.id) || (taskLike.expectedFrom ? `Wartet auf ${taskLike.expectedFrom}` : 'Noch kein relevanter Progress-Status')
 }
 
+function delegationSummary(taskLike: TaskDto): string | null {
+  if (taskLike.parentTaskId) return 'Sichtbare Child-Delegation'
+  if (children.value.length) return `${children.value.length} sichtbare Child-Tasks`
+  if (taskLike.isAgentTask) return 'Delegation im Board sichtbar'
+  return null
+}
+
 /* ── API calls ───────────────────────────────── */
 async function loadTask() {
   loading.value = true
@@ -380,6 +387,7 @@ function handleKeydown(e: KeyboardEvent) {
           <span v-if="task.isAgentTask" class="meta-chip">🤖 Agent-Task</span>
           <span v-if="task.expectedFrom" class="meta-chip">⏳ Erwartet: {{ task.expectedFrom }}</span>
           <span v-if="task.parentTaskId" class="meta-chip">↳ Sichtbare Child-Task</span>
+          <span v-if="delegationSummary(task)" class="meta-chip">{{ delegationSummary(task) }}</span>
         </div>
       </div>
 
@@ -408,8 +416,9 @@ function handleKeydown(e: KeyboardEvent) {
             </span>
           </div>
 
-          <div v-if="task.isAgentTask || childStatusSummary(task.id)" class="progress-banner">
+          <div v-if="task.isAgentTask || childStatusSummary(task.id) || delegationSummary(task)" class="progress-banner">
             <strong>Letzter Fortschritt:</strong> {{ progressHint(task) }}
+            <span v-if="delegationSummary(task)" class="delegation-inline">· {{ delegationSummary(task) }}</span>
           </div>
 
           <!-- Description -->
@@ -577,6 +586,7 @@ function handleKeydown(e: KeyboardEvent) {
             <dl class="info-list">
               <div><dt>ID</dt><dd>#{{ task.id.slice(0, 8) }}</dd></div>
               <div><dt>Quelle</dt><dd>{{ task.source || '—' }}</dd></div>
+              <div v-if="delegationSummary(task)"><dt>Delegation</dt><dd>{{ delegationSummary(task) }}</dd></div>
               <div><dt>Erstellt</dt><dd>{{ formatDate(task.createdAt) }}</dd></div>
               <div><dt>Geändert</dt><dd>{{ formatDate(task.updatedAt, true) }}</dd></div>
               <div v-if="task.isAgentTask"><dt>Letzter Status</dt><dd>{{ relativeTime(task.lastActivityAt ?? task.updatedAt) }}</dd></div>