Linux and Windows each wrote the same eleven pre-initialize mpv options
(keep-open, idle, input disabling, OSC, ytdl, audio fallback, and the
audio-only set); ApplyCommonStartupOptions in mpv_player_common.h owns
them once, with the ytdl security rationale kept in one place. Rendering,
windowing, HDR, and log-level options stay per platform.
The Android JNI event thread forwarded every mpv event to Kotlin, where
MpvEvent modelled ten variants but MpvPlayerCore consumes four. The
native switch now forwards only START_FILE, FILE_LOADED, and
PLAYBACK_RESTART (END_FILE keeps its own path), and the unused variants
are gone.
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