fix(backend): add trailing slash to Gerrit account validation API

[ch15084]

Gerrit REST API 在某些环境下（如特定反向代理后）对 /accounts/self 会触发重定向，导致认证上下文丢失并返回 401。添加末尾斜杠可直接访问最终接口，提高兼容性。

Summary by CodeRabbit

• Bug Fixes

  • Fixed Gerrit token validation endpoint compatibility by updating the API call format.

• Tests

  • Updated test cases to verify the corrected endpoint format.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: bf8c46b3-141f-4b81-9cb3-67e18d662d10

📥 Commits

Reviewing files that changed from the base of the PR and between c6fb733 and 77a988b.

📒 Files selected for processing (2)

• backend/app/repository/gerrit_provider.py
• backend/tests/repository/test_gerrit_provider.py

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📝 Walkthrough

Walkthrough

The Gerrit provider's validate_token method and its corresponding tests were updated to use a trailing slash in the account endpoint URL (/accounts/self/ instead of /accounts/self). No functional logic changes were made.

Changes

Cohort / File(s)	Summary
Gerrit Account Endpoint URL backend/app/repository/gerrit_provider.py, backend/tests/repository/test_gerrit_provider.py	Updated the Gerrit account endpoint URL from /accounts/self to /accounts/self/ (with trailing slash) in the validate_token method and all three related test cases.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

A trailing slash, so small yet keen,
Makes endpoints consistent, clean!
Through tests and code it flows with grace,
A rabbit hops through cyberspace. 🐰✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding a trailing slash to the Gerrit account validation API endpoint.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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