⚡ Bolt: Optimized Gemini to OpenAI function call streaming

[rschumann]

⚡ Bolt: Optimized Gemini to OpenAI function call streaming

💡 What: Replaced map[int]*strings.Builder, map[int]string, and map[int]string with corresponding slices in geminiToResponsesState struct. Replaced bubble sort logic with natural slice iteration.

🎯 Why: The previous implementation used maps keyed by sequential integers (output_index) to store function call fragments. This incurred map hashing overhead and required an O(N^2) sort at the end to ensure deterministic output order. Slices provide O(1) access and inherent ordering.

📊 Impact:

• Reduces memory allocations by ~8.4% (5693 -> 5213 B/op).
• Reduces allocation count by ~6.5% (46 -> 43 allocs/op).
• Improves CPU execution time by ~4.8% (13537 -> 12886 ns/op).

🔬 Measurement: Confirmed via BenchmarkConvertGeminiResponseToOpenAIResponses_FunctionCall.

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PR created automatically by Jules for task 4581857501263411997 started by @rschumann

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