Add Gemini integration with optional dependencies

[AHGIJMKLKKZNPJKQR]

Description

Added optional Gemini integration under fishjam.integrations.gemini

Documentation impact

• Documentation update required
• Documentation updated in another PR
• No documentation update required

Types of changes

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

[linear]

FCE-2498 Add gemini to python-server-sdk

[Copilot]

Pull request overview

This PR adds Gemini integration support to the Fishjam SDK with optional dependencies. The integration allows users to create Gemini clients with custom headers for SDK identification, while keeping the Gemini dependencies optional to avoid bloating installations for users who don't need this functionality.

Key changes:

• Added optional dependency group for Google Gemini integration
• Created version module to expose SDK version information
• Implemented Gemini integration wrapper with custom client creation

Reviewed changes

Copilot reviewed 4 out of 6 changed files in this pull request and generated 4 comments.

File	Description
pyproject.toml	Added gemini optional dependency group and reformatted workspace members list, removed trailing blank lines
fishjam/version.py	New module to retrieve and expose SDK version from package metadata
fishjam/integrations/gemini.py	New integration module providing Gemini client creation with Fishjam SDK headers
fishjam/init.py	Imported version module and exposed __version__ at package level

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[Copilot]

Pull request overview

Copilot reviewed 9 out of 11 changed files in this pull request and generated no new comments.

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