⚡ Bolt: Optimize trailer lookup I/O

[google-labs-jules]

💡 What:
Wrapped the "potential trailer files" detection logic in GetTrailerInfo with a check for Plugin.Instance.Configuration.EnableDebugLogging.

🎯 Why:
Previously, when a user requested trailer info for a movie that didn't have one, the server would unconditionally scan the movie's directory for files to log potential mismatches. This involves synchronous I/O operations (Directory.GetFiles) which are expensive and unnecessary for normal operation, especially when browsing libraries with many items lacking trailers.

📊 Impact:
Eliminates disk I/O for "trailer not found" cases when debug logging is disabled (default). This reduces latency and disk usage.

🔬 Measurement:
Verified by code analysis. The logic inside the if block performs I/O operations solely for the purpose of calling LoggingHelper.LogDebug. If debug logging is disabled, these logs are discarded anyway, making the I/O work completely redundant. The change ensures this work is skipped entirely.

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PR created automatically by Jules for task 13727270288210195685 started by @Fovty

[google-labs-jules]

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