clear timer when delete cached data from cache

[jungleyu]

[中文版模板 / Chinese template]

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🔗 Related issue link

💡 Background and solution

The timer was not removed when delete cached data from the map, which will cause unexpected data deletion.

📝 Changelog

Language	Changelog
🇺🇸 English	Clear the timer before invoke cache.delete(cacheKey)
🇨🇳 Chinese	在调用cache.delete(cacheKey)之前清除可能设置的timer

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[Copilot]

Pull request overview

Fixes a cache eviction bug in useRequest’s in-memory cache where timers could outlive deleted cache entries and later delete newly-created entries for the same key.

Changes:

• Introduce a clearTimer helper to centralize timeout cleanup.
• Ensure clearCache(key) and clearCache() clear any outstanding timers before deleting cache entries.

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