⚡ Bolt: Pre-compile Regex in model importers

[LeanBitLab]

💡 What: Extracted Regex instantiations in HandwritingModelImporter and TranslationModelImporter out of their local scopes and into companion objects (or object-level private val properties) so they are compiled once at initialization.

🎯 Why: In methods like detectLanguageCode and detectLanguageTag, a new Regex was being allocated and compiled on every invocation, and in TranslationModelImporter this even occurred inside a loop reading ZIP entries.

📊 Expected Impact: Eliminates runtime regex compilation overhead and transient allocations during language detection and importing workflows.

🔬 Verification:

• assembleStandardDebug succeeded.
• testStandardDebugUnitTest succeeded.
• Em dashes checked.

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PR created automatically by Jules for task 15444921821559476927 started by @LeanBitLab

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