When pages_enabled.search is false, instead of blocking search entirely,
the search bar now searches within the user's subscriptions and saved
playlists only. YouTube's search API is never called.
Changes:
- routes/search.cr: detect search_disabled, force subscription+playlist
search for logged-in users, 403 for anonymous users
- search/processors.cr: new subscriptions_and_playlists() method that
queries both the subscription materialized view and playlist_videos
table, merges and deduplicates results
- before_all.cr: let /search through to the route handler (APIs still
blocked), keep /hashtag/* blocked
- search_box.ecr: dynamic placeholder ("Search subscriptions & playlists")
- search_homepage.ecr: hint text when in subscription-only mode
- search.ecr: hide YouTube filters, show lock icon + notice, custom
empty-results message
- template.ecr: always show search bar (subscription search needs it)
- en-US.json: 6 new locale strings for subscription-only search UX
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