⚡ Optimize WebP conversion fallback with parallel execution

[Ven0m0]

💡 What: Replaced the sequential find -exec fallback in to_webp function of bin/media-opt.sh with a parallelized find | xargs -P implementation.

🎯 Why: To improve performance when fd is not available, leveraging multi-core processing for WebP conversion, which is a CPU-intensive task.

📊 Measured Improvement:

• Baseline (Sequential): ~680ms for 100 files (mocked workload)
• Optimized (Parallel): ~217ms for 100 files (mocked workload)
• Speedup: ~3.1x faster in synthetic benchmark. Real-world gains will scale with CPU core count and image size.

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PR created automatically by Jules for task 9916600839533516495 started by @Ven0m0

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