feat: phone webhook integration (callstart/callend on port 8081)

- New webhook server on port 8081 for phone system (PBX)
- Endpoints: GET/POST /{extension}/callstart and /{extension}/callend
- New 'phone_extension' field on users (Durchwahl)
- Only activates when user is anwesend or homeoffice (AIDA)
- Sets WLED to phone_active color (red) on callstart
- Restores previous Teams/AIDA color on callend
- Polling skips WLED update while phone is active
- Dashboard shows phone badge when user is in a call
- New color rule 'phone_active' (configurable via web UI)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

templates/dashboard.html

@@ -81,6 +81,10 @@
                                     <span class="badge bg-light text-dark"><i class="bi bi-microsoft-teams"></i> {{ seg.teams }}</span>
                                 {% endif %}
                             {% endif %}
+
+                            {% if seg.phone %}
+                                <span class="badge bg-danger"><i class="bi bi-telephone-fill"></i> Telefoniert</span>
+                            {% endif %}
                         </div>
                         {% endif %}
                     {% else %}

templates/users.html

@@ -35,6 +35,7 @@
                         <th>Name</th>
                         <th>E-Mail</th>
                         <th>Personal-Nr (AIDA)</th>
+                        <th>Durchwahl</th>
                         <th>Zuordnung</th>
                         <th>Aktionen</th>
                     </tr>
@@ -57,6 +58,19 @@
                                        class="form-control form-control-sm" style="width: 120px;"
                                        placeholder="~~00000~~">
                                 <input type="hidden" name="active" value="{{ '1' if user.active else '0' }}">
+                                <input type="hidden" name="phone_extension" value="{{ user.phone_extension or '' }}">
+                                <button type="submit" class="btn btn-sm btn-outline-secondary">
+                                    <i class="bi bi-check"></i>
+                                </button>
+                            </form>
+                        </td>
+                        <td>
+                            <form method="post" action="/api/users/{{ user.azure_id }}/update" class="d-flex gap-1">
+                                <input type="text" name="phone_extension" value="{{ user.phone_extension or '' }}"
+                                       class="form-control form-control-sm" style="width: 80px;"
+                                       placeholder="z.B. 123">
+                                <input type="hidden" name="personal_nr" value="{{ user.personal_nr or '' }}">
+                                <input type="hidden" name="active" value="{{ '1' if user.active else '0' }}">
                                 <button type="submit" class="btn btn-sm btn-outline-secondary">
                                     <i class="bi bi-check"></i>
                                 </button>