fix(ai): Resolve Memory Leak in Asynchronous Gemini API SSE Stream Handler (#3949)

[knoxiboy]

Description

Fixes an unclosed connection and buffer memory leak in backend/services/gemini_stream_service.py by ensuring explicit generator cleanup and AsyncClient closure when SSE stream connections terminate or disconnect unexpectedly.

Related Issue

Fixes #3949

Type of Change

• 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)
• Documentation update
• Configuration change

Checklist

• My code follows the project's coding style
• I have performed a self-review of my code
• I have commented my code where necessary
• I have updated the documentation accordingly
• My changes generate no new warnings
• I have added tests that prove my fix is effective or my feature works
• New and existing unit tests pass locally with my changes

Additional Notes

Wraps SSE event generator iterations in explicit try...finally blocks to release active client sockets.

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