fix: player connectivity and media download pipeline

- nginx: add /api/ shortcut block (no portal auth, X-Script-Name /digiserver,
  Host $http_host) so players can reach DigiServer API without /digiserver prefix
- nginx: use $http_host in /api/ block so Flask host_url includes port — fixes
  media download URLs missing :8080 (was http://ip/digiserver/... not http://ip:8080/...)
- player main.py: fix double-port bug when server_ip already contains a port
  (e.g. 192.168.0.230:8080 was producing http://192.168.0.230:8080:80)
- get_playlists_v2.py: force re-sync when server version differs OR local media
  files are missing on disk — fixes stale playlist after server reset
- digiserver api.py: playlist endpoint builds full media URLs using script_root
  from X-Script-Name header set by nginx
- weblink support, player build/deploy improvements, manage-playlist AJAX prefix fix

digiserver-v2/app/templates/content/manage_playlist_content.html

@@ -314,11 +314,18 @@
                         </td>
                         <td><span class="drag-handle">⋮⋮</span></td>
                         <td>{{ loop.index }}</td>
-                        <td>{{ content.filename }}</td>
+                        <td>
+                            {% if content.content_type == 'weblink' %}
+                                <a href="{{ content.url }}" target="_blank" rel="noopener noreferrer">{{ content.url }}</a>
+                            {% else %}
+                                {{ content.filename }}
+                            {% endif %}
+                        </td>
                         <td>
                             {% if content.content_type == 'image' %}📷 Image
                             {% elif content.content_type == 'video' %}🎥 Video
                             {% elif content.content_type == 'pdf' %}📄 PDF
+                            {% elif content.content_type == 'weblink' %}🔗 Web Link
                             {% else %}📁 Other{% endif %}
                         </td>
                         <td>
@@ -400,7 +407,23 @@
         
         <div class="card">
             <h2 style="margin-bottom: 20px;">➕ Add Content</h2>
-            
+
+            <div style="margin-bottom: 24px; padding-bottom: 24px; border-bottom: 1px solid #e0e0e0;">
+                <h3 style="margin-bottom: 12px; font-size: 16px;">🔗 Add Web Link</h3>
+                <form method="POST"
+                      action="{{ url_for('content.add_weblink_to_playlist', playlist_id=playlist.id) }}">
+                    <input type="url" name="url" required
+                           placeholder="https://example.com/dashboard"
+                           style="width: 100%; padding: 8px; margin-bottom: 8px; box-sizing: border-box;">
+                    <div style="display: flex; gap: 8px; align-items: center;">
+                        <label style="font-size: 13px; color: #666;">Duration (s):</label>
+                        <input type="number" name="duration" value="30" min="1"
+                               style="width: 80px; padding: 6px;">
+                        <button type="submit" class="btn btn-primary btn-sm">+ Add Link</button>
+                    </div>
+                </form>
+            </div>
+
             {% if available_content %}
             <div class="available-content">
                 {% for content in available_content %}
@@ -543,7 +566,7 @@ function changeDuration(contentId, change) {
     
     // Save to server
     const playlistId = {{ playlist.id }};
-    const url = `/content/playlist/${playlistId}/update-duration/${contentId}`;
+    const url = `{{ request.script_root }}/content/playlist/${playlistId}/update-duration/${contentId}`;
     const formData = new FormData();
     formData.append('duration', newDuration);
     
@@ -579,7 +602,7 @@ function changeDuration(contentId, change) {
 function toggleAudio(contentId, enabled) {
     const muted = !enabled; // Checkbox is "enabled audio", but backend stores "muted"
     const playlistId = {{ playlist.id }};
-    const url = `/content/playlist/${playlistId}/update-muted/${contentId}`;
+    const url = `{{ request.script_root }}/content/playlist/${playlistId}/update-muted/${contentId}`;
     
     const formData = new FormData();
     formData.append('muted', muted ? 'true' : 'false');
@@ -610,7 +633,7 @@ function toggleAudio(contentId, enabled) {
 
 function toggleEdit(contentId, enabled) {
     const playlistId = {{ playlist.id }};
-    const url = `/content/playlist/${playlistId}/update-edit-enabled/${contentId}`;
+    const url = `{{ request.script_root }}/content/playlist/${playlistId}/update-edit-enabled/${contentId}`;
     
     const formData = new FormData();
     formData.append('edit_enabled', enabled ? 'true' : 'false');