fix(movies): dedup playback sources by target (cross-mirror dupes)

Movie detail showed ~100 playback links (report 41ca1fa4) because the 3 dooplay mirrors (mangoporn/pandamovies/streamporn) each record the SAME hoster embed as a separate row (e.g. luluvid/e/X from all three). Dedup by real target (embed_url/stream_url/page_url) after the priority sort, keeping the highest-priority copy — one verified movie drops 101 -> 58 unique.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/api/movies.py

@@ -251,6 +251,20 @@ def _movie_to_out(session: Session, movie: Movie, *, device_id: str = LEGACY_DEV
     if has_subhost:
         pb_rows = [p for p in pb_rows if p.origin not in _MOVIE_LANDING_HIDE]
     pb_rows = sorted(pb_rows, key=lambda p: _movie_origin_priority(p.origin))
+    # Dedup po realnym celu: 3 mirrory dooplay (mangoporn/pandamovies/streamporn)
+    # zapisują TEN SAM embed hostera jako osobne wiersze (np. luluvid/e/X z każdego
+    # mirrora) → film miał ~100 linków, z czego ~połowa to ten sam film (bug-report
+    # 41ca1fa4). Zostawiamy pierwszy = najwyższy priorytet (sort wyżej).
+    seen_targets: set[str] = set()
+    deduped: list[MoviePlaybackSource] = []
+    for p in pb_rows:
+        target = (p.embed_url or p.stream_url or p.page_url or "").strip()
+        if target and target in seen_targets:
+            continue
+        if target:
+            seen_targets.add(target)
+        deduped.append(p)
+    pb_rows = deduped
     playback_sources = [PlaybackSourceOut.model_validate(p) for p in pb_rows]
 
     is_fav = session.get(FavoriteMovie, (device_id, movie.id)) is not None