곡 보관함과 악보 학습 기능을 보완

업로드 형식을 MIDI와 MusicXML과 MXL 및 PDF로 확장하고 파일별 검증을 추가했다.

AlphaTab 악보 자산과 Nginx MIME 설정을 보완해 운영에서 오선과 음표가 표시되도록 수정했다.

공개 도메인 클래식과 난이도별 연습 편곡 7개를 같은 제목별로 묶고 출처와 운영 검증 결과를 문서화했다.

검사: TypeScript 검사와 Vitest 67개 및 Vite 운영 빌드 통과. 운영 브라우저 악보 표시와 네 가지 업로드 검증 형식 확인.
백업: /home/syskiller/piano/backups/bach-to-basics/20261003-1545-sheet-upload
운영 반영: 완료
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Copyright © 2015, Steinberg Media Technologies GmbH (http://www.steinberg.net/),
with Reserved Font Name "Bravura".
This Font Software is licensed under the SIL Open Font License, Version 1.1.
This license is copied below, and is also available with a FAQ at:
http://scripts.sil.org/OFL
-----------------------------------------------------------
SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
-----------------------------------------------------------
PREAMBLE
The goals of the Open Font License (OFL) are to stimulate worldwide
development of collaborative font projects, to support the font creation
efforts of academic and linguistic communities, and to provide a free and
open framework in which fonts may be shared and improved in partnership
with others.
The OFL allows the licensed fonts to be used, studied, modified and
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fonts, including any derivative works, can be bundled, embedded,
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names are not used by derivative works. The fonts and derivatives,
however, cannot be released under any other type of license. The
requirement for fonts to remain under this license does not apply
to any document created using the fonts or their derivatives.
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Holder(s) under this license and clearly marked as such. This may
include source files, build scripts and documentation.
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