Fix: add tmdb_id and imdb_id to Xtream get_series response

The get_series endpoint was omitting tmdb_id and imdb_id fields that
are already present on the Series model and already included in the
get_vod_streams (movies) response.

Xtream clients such as Chillio use these IDs to fetch proper metadata
from TMDB, including sanitized series titles and poster images. Without
them, clients fall back to the raw provider name (which may include
provider prefixes like ┃NL┃) and the proxied cover URL instead of
TMDB's poster.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/output/views.py

@@ -2523,6 +2523,8 @@ def xc_get_series(request, user, category_id=None):
             "episode_run_time": series.custom_properties.get('episode_run_time', '') if series.custom_properties else "",
             "category_id": str(relation.category.id) if relation.category else "0",
             "category_ids": [int(relation.category.id)] if relation.category else [],
+            "tmdb_id": series.tmdb_id or "",
+            "imdb_id": series.imdb_id or "",
         })
 
     return series_list