fix: ensure directories exist before use and update cover metadata

[kt286]

• Pre-create config/cache/database directories using QDir::mkpath() to fix build on MSYS2 where directories may not exist yet
• Simplify directory creation logic in MusicSettings
• Emit metaChanged signal when cover is ready for current playing media
• Fetch latest cover/lyric metadata from database in getActivateMeta()

fix: 确保目录在使用前已创建，并修复封面元数据更新

• 使用 QDir::mkpath() 预创建配置/缓存/数据库目录， 修复 MSYS2 构建时目录不存在的问题
• 简化 MusicSettings 中的目录创建逻辑
• 当前播放歌曲的封面就绪时发送 metaChanged 信号
• 在 getActivateMeta() 中从数据库获取最新的封面和歌词路径

Summary by Sourcery

Ensure application creates required config, cache, and database directories before use and keeps active media cover/lyric metadata in sync with the database.

New Features:

• Emit metaChanged when the cover for the currently playing media becomes ready to keep the UI in sync with metadata updates.

Bug Fixes:

• Refresh active media metadata from the database in getActivateMeta to use the latest cover and lyric information.
• Pre-create application config, cache, and database directories to prevent failures when paths do not yet exist, including on MSYS2 builds.

Enhancements:

• Simplify directory creation logic in MusicSettings and central path initialization by using QDir::mkpath for required directories.

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This pull-request has been approved by: kt286

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Ensures required config/cache/database directories are pre-created using QDir::mkpath, simplifies image directory setup in MusicSettings, and fixes cover/lyric metadata freshness and metaChanged signaling for the currently playing media.

Sequence diagram for updated cover ready signaling and metaChanged emission

sequenceDiagram
    participant DataManager
    participant Presenter
    participant PlayerEngine

    DataManager->>Presenter: signalMetaCoverReady(meta)
    Presenter->>Presenter: emit metaCoverReady(Utils::metaToVariantMap(meta))
    Presenter->>PlayerEngine: getMediaMeta()
    PlayerEngine-->>Presenter: MediaMeta currentMeta
    Presenter-->>Presenter: [currentMeta.hash == meta.hash]
    Presenter->>Presenter: emit metaChanged()

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Sequence diagram for getActivateMeta fetching freshest cover and lyric metadata

sequenceDiagram
    participant Presenter
    participant PlayerEngine
    participant DataManager

    Presenter->>Presenter: getActivateMeta()
    Presenter->>PlayerEngine: getMediaMeta()
    PlayerEngine-->>Presenter: MediaMeta meta
    Presenter-->>Presenter: [!meta.hash.isEmpty()]
    Presenter->>DataManager: metaFromHash(meta.hash)
    DataManager-->>Presenter: MediaMeta latestMeta
    Presenter-->>Presenter: [!latestMeta.hash.isEmpty()]
    Presenter-->>Presenter: update meta.coverUrl, meta.hasimage, meta.lyricPath
    Presenter->>Presenter: Utils::metaToVariantMap(meta)

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File-Level Changes

Change	Details	Files
Emit metaChanged when the current track’s cover metadata becomes ready and ensure getActivateMeta returns up-to-date cover/lyric info from the database.	Connect DataManager::signalMetaCoverReady handler to emit metaChanged when the ready cover’s hash matches the currently playing media’s hash. Update getActivateMeta to start from the player engine’s current MediaMeta, then refresh coverUrl/hasimage/lyricPath from DataManager::metaFromHash when available. Return the refreshed MediaMeta via Utils::metaToVariantMap instead of the raw engine meta.	src/libdmusic/presenter.cpp
Simplify cover image directory creation in MusicSettings and ensure the config path exists before using the settings backend.	Replace manual images directory creation logic with a single QDir::mkpath call on cachePath()/images. Create the parent directory for config.ini via QDir::mkpath(QFileInfo(configFilepath).absolutePath()) before initializing QSettingBackend.	src/libdmusic/core/musicsettings.cpp
Guarantee database and global user config/cache directories exist before opening the SQLite DB or using paths, improving robustness on platforms like MSYS2.	Include QDir in DataManager implementation to support directory creation. Before opening the SQLite database, call QDir::mkpath on QFileInfo(dbPath).absolutePath() to ensure the DB directory exists. In DmGlobal::initPath, call QDir::mkpath on userConfigPath and userCachePath immediately after resolving them from DStandardPaths.	src/libdmusic/core/datamanager.cpp src/libdmusic/global.cpp

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