When a user picks Hybrid mode AND downloads an album, the per-track
search loop fires once per track. Torrent / usenet are release-level
sources — Prowlarr returns album torrents, none of which score
meaningfully against an individual track title. Without filtering,
every track triggered a redundant Prowlarr search, qBit rejected
duplicate hashes after the first, and the run only worked at all
because Auto-Import swept Staging behind the scenes. Confusing
logs, wasted searches, brittle timing.
Fix: thread an optional ``exclude_sources`` parameter through
``DownloadOrchestrator.search``. When the per-track worker detects
that the active batch is an album AND mode is hybrid, it passes
``['torrent', 'usenet']`` so the hybrid chain skips them and falls
through to per-track-compatible sources (Soulseek / streaming).
Gate is narrow on purpose:
- Hybrid + album → skip torrent / usenet (THIS fix)
- Single-source torrent / usenet + album → album-bundle flow on
the master worker (already shipped)
- Hybrid + single-track batch (basic search / wishlist / playlist
of singles) → torrent / usenet still tried, validation.py's
album-name fallback gives them a shot
Excluded list logged at INFO when applied so the behavior is
visible in logs ("Hybrid search: excluding ['torrent', 'usenet']
for this query"). Default ``exclude_sources=None`` keeps every
non-task-worker caller (basic search, stream search, search-and-
download-best, automation handlers) on the original code path.
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