feat(download): add log capture and file actions (#157)

* feat(download): add log capture and file actions

* fix(ci): update ffmpeg download source

* fix(ci): consolidate ffmpeg download source to yt-dlp repository

Update FFmpeg download URLs to use yt-dlp/FFmpeg-Builds as the primary source across all platforms and remove BtbN fallback repository reference.

src/main/lib/database/schema.ts

@@ -16,6 +16,7 @@ export const downloadHistoryTable = sqliteTable('download_history', {
   sortKey: integer('sort_key', { mode: 'number' }).notNull(),
   error: text('error'),
   ytDlpCommand: text('yt_dlp_command'),
+  ytDlpLog: text('yt_dlp_log'),
   description: text('description'),
   channel: text('channel'),
   uploader: text('uploader'),