Fix/gemini base url not work

[aixgeek]

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Important

Fixes GeminiHandler to use custom base URL for token counting if googleGeminiBaseUrl is set.

• Behavior:
  • Fixes issue with GeminiHandler not using custom base URL for token counting.
  • Adds httpOptions with baseUrl in countTokens() if googleGeminiBaseUrl is set.
• Misc:
  • No changes to other methods or files.

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[roomote]

Rooviewer   See task on Roo Cloud

Review complete. The change properly fixes the issue where countTokens() was not using the custom base URL. The implementation is consistent with other methods (createMessage() and completePrompt()) and follows the established pattern in the codebase.

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