fix: fix refresh token deadlock

[fatelei]

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Summary

fix #30827

fix refresh token deadlock, always delete refresh token

Screenshots

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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint and make type-check (backend) and cd web && npx lint-staged (frontend) to appease the lint gods

[gemini-code-assist]

Summary of Changes

Hello @fatelei, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request provides a critical fix for a refresh token deadlock, particularly in multi-tab browsing environments. By ensuring that the refresh lock is always cleared, the system prevents potential deadlocks caused by stale lock states, thereby improving the robustness and reliability of token management.

Highlights

• Deadlock Resolution: This pull request addresses and fixes a refresh token deadlock issue, specifically targeting scenarios that might occur across multiple browser tabs.
• Unconditional Lock Release: The releaseRefreshLock function has been modified to unconditionally clear the refresh lock, including setting isRefreshing to false and removing related items from localStorage.
• Cross-Tab Safety: The change ensures that the refresh lock is always cleared, which is crucial for preventing cross-tab deadlocks and maintaining consistent token management.

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[gemini-code-assist]

Code Review

This pull request effectively resolves a potential deadlock in the cross-tab token refresh logic. By removing the conditional check in releaseRefreshLock, the function now always clears the refresh lock from localStorage. This prevents waiting tabs from getting stuck if their own refresh attempt times out, which is a robust solution to the deadlock problem. The added comment clearly explains the reasoning behind this change. The fix is well-implemented and improves the overall resilience of the authentication mechanism.