⚡ Optimize img-webp.sh find fallback with parallel execution

[Ven0m0]

💡 What:
Optimized the fallback path in bin/img-webp.sh when fd is not available. The original implementation used find ... -exec ... \; which processes files sequentially. The new implementation uses find ... -print0 | xargs -0 -P $(nproc) ... to process files in parallel.

🎯 Why:
Sequential processing is slow for large numbers of images, especially on multi-core devices. Parallel processing significantly reduces the total time required for conversion.

📊 Measured Improvement:
Benchmark run on 50 dummy images with a mock cwebp (0.05s sleep):

• Baseline: 3409 ms
• Optimized: 842 ms
• Speedup: ~4.05x (on a 4-core system)

The optimization correctly handles filenames with spaces and ensures robust error handling.

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PR created automatically by Jules for task 8711833330621188094 started by @Ven0m0

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