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/blueprints/api.py

@@ -404,13 +404,17 @@ def get_cached_playlist(player_id: int) -> List[Dict]:
         script_root = current_request.script_root.rstrip('/')
         content_url = f"{server_base}{script_root}/static/uploads/{content.filename}"
         
+        # Web links carry the page URL directly instead of a file download URL.
+        is_weblink = content.content_type == 'weblink'
+        item_url = content.url if is_weblink else content_url
+
         playlist_data.append({
             'id': content.id,
             'file_name': content.filename,  # Player expects 'file_name' not 'filename'
             'type': content.content_type,
             'duration': content._playlist_duration or content.duration or 10,
             'position': content._playlist_position or idx,
-            'url': content_url,  # Full URL for downloads
+            'url': item_url,  # Web page URL for weblinks, file download URL otherwise
             'description': content.description,
             'edit_on_player': getattr(content, '_playlist_edit_on_player_enabled', False)
         })