feat: CC接口限频优化 (closed #2531)

[ping15]

PR

CheckList（PR Assigners）

确认已完成以下操作：

• 已将分支与当前合入分支同步
• 已在关联 Issue 中补充「功能自测」部分内容
• 已更新关联 Issue 的状态 backlog -> todo -> for test -> tested（需通过测试同学测试） -> done
• 将 PR 添加上 pr/reviewable

CheckList（PR Reviewers）

确认已完成以下操作：

• 检查关联 Issue 「功能自测」部分内容
• 必要时打回 pr/reviewable，要求重新修改
• 及时 Approve

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 55.31915% with 21 lines in your changes missing coverage. Please review.

Project coverage is 75.04%. Comparing base (4f86151) to head (ae38f0f).
Report is 7 commits behind head on v2.4.8-dev.

Files with missing lines	Patch %	Lines
apps/backend/subscription/tools.py	50.00%	20 Missing ⚠️
apps/backend/subscription/commons.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           v2.4.8-dev    #2533      +/-   ##
==============================================
- Coverage       75.16%   75.04%   -0.13%     
==============================================
  Files             407      407              
  Lines           29544    29627      +83     
==============================================
+ Hits            22208    22234      +26     
- Misses           7336     7393      +57     

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