⚡ Bolt: Optimize case-insensitive prefix matching to prevent allocation

[callmeradical]

💡 What: Replaced strings.HasPrefix(strings.ToLower(...)) with a length check and strings.EqualFold.
🎯 Why: strings.ToLower forces a memory allocation on every HTTP response processed by the proxy. Avoiding this reduces garbage collection overhead in the hot path.
📊 Impact: Saves 1 string allocation per HTTP response proxy operation.
🔬 Measurement: Run standard memory profiles/benchmarks on the proxy during high-throughput JSON-RPC proxying to verify reduced allocation count.

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PR created automatically by Jules for task 7136401974761060552 started by @callmeradical

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