fix: Remove `proxy_cache ` from the global config to prevent it from being enabled for sites that don't need caching.

[Anyexyz]

trafficstars

What this PR does / why we need it?

Fix the problem in https://bbs.fit2cloud.com/t/topic/8868.

Summary of your change

Removed proxy_cache from global cache configuration.

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• [x] Made sure tests are passing and test coverage is added if needed.
• [x] Made sure commit message follow the rule of Conventional Commits specification.
• [x] Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

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[zhengkunwang223]

这个配置是给反代缓存用的，去掉会出问题

[wanghe-fit2cloud]

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This configuration is used for reverse generation caching. Removing it will cause problems.

[bh1xaq]

Based on the configuration of version v1, it seems more suitable to explicitly declare proxy_cache off for sites where caching is not enabled.