feat(db): キャッシュ横断検索に投稿者と添付の絞り込みを足す (notedeck#945)

[hitalin]

notedeck#945 (クライアント検索) の段階 1: 横断検索経路に絞り込みを足す。

• search_cached_notes_across の引数を CachedSearchOptions にまとめる (query / limit / since / until / ascending / author / has_files)
• author: name または name@host。大文字小文字を区別せず、ローカルユーザー (user.host が null) は取得元サーバーで補う
• has_files: json_array_length(note_json, '$.files') で添付の有無
• 単一アカウント版 search_cached_notes_advanced は薄いラッパのまま

🤖 Generated with Claude Code

https://claude.ai/code/session_0129MFAxbj2vmL1Gu8FsgHLk

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