feat: disable cache with proper headers when CACHE_SECONDS env is zero

[opheliagoldstein]

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[opheliagoldstein]

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[Copilot]

Pull Request Overview

This PR adds functionality to disable caching when the CACHE_SECONDS environment variable is set to zero, implementing proper cache-busting headers for better cache control.

• Refactored cache seconds resolution logic to handle zero values properly
• Added a new disableCaching function that sets appropriate no-cache headers
• Updated both normal and error cache handling to respect zero cache seconds
• Added comprehensive test coverage for the new caching behavior

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
tests/api.test.js	Added test setup and new test cases for cache behavior with CACHE_SECONDS environment variable
src/common/cache.js	Implemented cache disabling logic and updated cache header functions to handle zero cache seconds

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