Add Auto Skip Filler Episodes setting

[Copilot]

Adds a player setting to automatically skip filler episodes during autoplay, leveraging existing Jikan/MAL filler detection data.

• Settings UI (SettingsViewPlayer.swift): New autoSkipFillers toggle (default off) placed after "Autoplay Next"
• Skip logic (MediaInfoView.swift): selectNextEpisode() now checks the setting and skips consecutive filler episodes using jikanFillerSet, gracefully handling the case where all remaining episodes are fillers
• Backup (SettingsViewBackup.swift): Added autoSkipFillers to persisted backup keys

if autoSkipFillers, let fillerSet = jikanFillerSet {
    while nextIndex < episodeLinks.count, fillerSet.contains(episodeLinks[nextIndex].number) {
        Logger.shared.log("Skipping filler episode \(episodeLinks[nextIndex].number)", type: "Debug")
        nextIndex += 1
    }
}

No new dependencies or APIs — entirely built on existing filler detection infrastructure.

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