⚡ Bolt: [performance improvement]

[cloudesize67-cmd]

💡 What: Changed the .collect::<Vec<_>>().join("") approach to .collect::<String>() when generating PascalCase strings from string sequences, and updated .collect::<String>() to .to_string() when lowercasing a single char in the camel_case routine.

🎯 Why: Avoids unnecessary intermediate heap allocations. Using .collect::<String>() directly iterates over elements and concatenates them without creating a temporary array, optimizing for both CPU time and memory.

📊 Impact: Reduces memory usage and improves runtime performance slightly across the entire SDK code generation pipeline where casing formatting is heavily used.

🔬 Measurement: Review lints and tests output via make check and make test-generator, which should all pass normally without any behavioral changes.

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PR created automatically by Jules for task 15129130508614735527 started by @cloudesize67-cmd

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