fix(token-search): use TrimPrefix for sk- token normalization

[RedwindA]

PR 类型

• Bug 修复
• 新功能
• 文档更新
• 其他

PR 是否包含破坏性更新？

• 是
• 否

PR 描述

修复后端 token 搜索逻辑中的字符串处理问题。

在 SearchUserTokens 中，原先使用 strings.Trim(token, "sk-") 对输入做处理，该方法会移除首尾所有属于 s / k /
- 的字符，可能错误修改 token 内容，导致搜索匹配失败。
本 PR 改为 strings.TrimPrefix(token, "sk-")，仅去除预期的 sk- 前缀，避免误删字符，恢复 token 搜索的正确性。

Summary by CodeRabbit

• Bug Fixes
  • Changed token normalization to exclusively remove the "sk-" prefix from the beginning of tokens, replacing the previous approach of trimming any 's', 'k', or '-' characters from either end. Token searching and matching may behave differently for affected tokens.

[coderabbitai]

Walkthrough

Token normalization logic in model/token.go updated to precisely remove only the "sk-" prefix using TrimPrefix() instead of the previous approach that removed any of the characters 's', 'k', or '-' from both ends of the string.

Changes

Cohort / File(s)	Summary
Token Normalization model/token.go	Changed token prefix removal from TrimCharacters (removing any 's', 'k', '-' from ends) to TrimPrefix(token, "sk-") for precise leading prefix removal only.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A prefix so precise, no more ambiguous trim,
"sk-" comes right off, no mess to the brim,
One careful line change, makes tokens sing true,
CodeRabbit hops by, says "perfect for you!" 🎯

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 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: replacing Trim with TrimPrefix for proper sk- prefix removal in token normalization logic.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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