feat: Add Telegram bot integration and task detail/delete UI

- Wire up Telegram bot with token, allowed users and username from .env
- Fix TaskBeat to handle direct tasks (Telegram/email) without sub_tasks
- Fix send_telegram_message to use run_coroutine_threadsafe (avoid event loop clash)
- Add TaskBeat watchdog thread for auto-restart on crash
- Reset stuck in_progress tasks on startup
- Add task detail page (/tasks/<id>) with full response/log view and auto-refresh
- Add task delete route (/tasks/delete/<id>) with confirmation
- Include agent sender info in Telegram task prompts
- Orchestrator self-updated knowledge base with Telegram contact info

templates/tasks.html

@@ -25,7 +25,7 @@
                 <th>Agent</th>
                 <th>Status</th>
                 <th>Erstellt</th>
-                <th>Aktion</th>
+                <th>Aktionen</th>
               </tr>
             </thead>
             <tbody>
@@ -66,16 +66,11 @@
                   {% endif %}
                 </td>
                 <td style="color:var(--text-muted);font-size:.75rem;">{{ task.created }}</td>
-                <td>
-                  {% if task.status == 'pending' %}
-                    <span style="color:var(--text-muted);font-size:.75rem;">⏳ Wartend</span>
-                  {% elif task.status == 'in_progress' %}
-                    <span style="color:var(--info);font-size:.75rem;">🔄 Läuft...</span>
-                  {% elif task.status == 'completed' %}
-                    <span style="color:var(--success);font-size:.75rem;">✓ Auto</span>
-                  {% else %}
-                    <span style="color:var(--text-muted);font-size:.75rem;">—</span>
-                  {% endif %}
+                <td class="d-flex gap-2 align-items-center flex-wrap">
+                  <a href="{{ url_for('task_detail', task_id=task.id) }}" class="btn btn-sm btn-outline-secondary" title="Details">Details</a>
+                  <form method="POST" action="{{ url_for('delete_task', task_id=task.id) }}" onsubmit="return confirm('Task #{{ task.id }} wirklich löschen?')" style="display:inline;">
+                    <button type="submit" class="btn btn-sm btn-outline-danger" title="Löschen">Löschen</button>
+                  </form>
                 </td>
               </tr>
               {% endfor %}