Fix: Provider like SiliconFlow show wrong tokens number on task header

[misskanagi]

Description

Added an option openAiUsageCumulation to ApiHandlerOptions which handle tokens statistics when using SiliconFlow as api provider. SiliconFlow return every prompt_tokens and completion_tokens as total number but not incremental.

User can use checkbox ("Enable token usage cumulation") to change tokens statistics mode on model settings tab.
It is default checked which using original execution pass when counting tokens.

Before fix:

After fix

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Checklist:

• My code follows the patterns of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

Additional context

Related Issues

#959

Reviewers

---

Important

Add openAiUsageCumulation option to handle SiliconFlow token statistics, with UI and state management updates.

• Behavior:
  • Added openAiUsageCumulation option to ApiHandlerOptions in api.ts to handle token statistics for SiliconFlow.
  • Updated processUsageMetrics() in openai.ts to use openAiUsageCumulation for token calculation.
  • Added checkbox in ApiOptions.tsx for enabling token usage cumulation.
• State Management:
  • Integrated openAiUsageCumulation into global state management in ClineProvider.ts.
  • Updated getState() and updateApiConfiguration() in ClineProvider.ts to handle openAiUsageCumulation.
• UI:
  • Added checkbox for "Enable token usage cumulation" in ApiOptions.tsx.

^{This description was created by for c8f8754. It will automatically update as commits are pushed.}

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