fix(cache): 修复缓存大小上限默认值处理

[MoYingJi]

0 是 falsy 值，使用 || 会导致预期为「不限制」的 0 被设置为默认值 10

[gemini-code-assist]

Summary of Changes

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此拉取请求旨在解决音乐缓存服务中一个关键的逻辑问题，即当用户将缓存大小上限设置为 0 以表示不限制时，由于使用了 || 操作符，该 0 值会被错误地解释为需要应用默认值 10。通过将 || 替换为 ??，确保了 0 能够被正确识别为有效配置，从而使“不限制”的意图得以正确实现，提升了缓存配置的准确性和灵活性。

Highlights

• 缓存逻辑修复: 修复了音乐缓存大小上限的默认值处理逻辑，确保当用户明确设置缓存上限为0时，该值能被正确识别为“不限制”。
• 操作符变更: 将 electron/main/services/MusicCacheService.ts 文件中的 || (逻辑或) 操作符替换为 ?? (空值合并) 操作符，以避免 0 被误判为假值。
• 零值处理: 此更改确保了 store.get("cacheLimit") 返回 0 时，limitSizeGB 变量将正确地赋值为 0，而不是回退到默认值 10。

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[gemini-code-assist]

Code Review

本次变更修复了缓存大小上限处理的一个逻辑问题。之前使用 || 操作符会导致用户设置的 0（代表不限制）被错误地覆盖为默认值 10。通过改用空值合并操作符 ??，确保了 0 作为一个有效的设置值被正确处理，只有在值为 null 或 undefined 时才会使用默认值。这是一个精准且重要的修复，提升了配置的可靠性。