⚡ Optimize repeated Regex compilation in string replacement utilities

[Aatricks]

💡 What:
Moved multiple inline, dynamically compiled Regex objects into statically initialized properties within companion objects across several files:

• NovelFireSource.kt
• MangaBatSource.kt
• BaseJsoupSource.kt
• SummaryService.kt
• ReaderViewModel.kt

🎯 Why:
Creating a Regex object inline means compiling the pattern every time the function is called. In utility functions or data parsing functions that are called frequently or within loops (such as parsing thousands of paragraphs or novel titles), this repeated compilation causes unnecessary CPU overhead and memory allocation. Pre-compiling them guarantees they are initialized only once.

📊 Measured Improvement:
Added a JUnit-based microbenchmark test (NovelFireSourceBenchmarkTest) that specifically measures the time to clean 6 distinct novel titles over 100,000 iterations.

• Baseline: ~1897 ms
• Optimized: ~349 ms
• Net Improvement: ~1548 ms speedup (an approximately 5.4x improvement on this specific regex string replacement operation).

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PR created automatically by Jules for task 18021026925504816743 started by @Aatricks

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