⚡ Bolt: [performance improvement] Cache dynamic RegExp patterns to static constants

[JustLookAtNow]

💡 What: Replaced dynamically compiled RegExp objects with statically cached ones across the codebase.
🎯 Why: Compiling regular expressions repeatedly inside loops, frequently called functions or isolate entry points introduces a classic performance bottleneck in Dart, resulting in CPU overhead and memory allocations.
📊 Impact: Faster HTML/text parsing during app runtime, especially noticeable inside loops processing torrent items in NexusPHPAdapter and NexusPHPWebAdapter. Less pressure on garbage collection.
🔬 Measurement: Run the internal benchmarking suite or monitor frames rendered in Flutter DevTools while scrolling torrents to observe improved stability.

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PR created automatically by Jules for task 17081055356529305676 started by @JustLookAtNow

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