Avoid unnecessary regex compilation in hot paths

[Smorki]

Description

Two small optimizations to avoid unnecessary regex pattern compilation on frequently-called methods.

1. BlockBreakLogger.log() — replace replaceFirst with replace

The lectern block data adjustment uses String.replaceFirst("has_book=true", "has_book=false"), which internally compiles a Pattern on every invocation. Since the search string is a literal (no regex metacharacters) and appears at most once in a BlockData string, String.replace(CharSequence, CharSequence) is functionally identical and avoids the pattern compilation.

This method is called for every block break on the server, which is one of the highest-frequency events CoreProtect logs.

Change: replaceFirst → replace (1 character).

2. Config.getInt() — cache the digit-strip pattern

getInt() calls configured.replaceAll("[^0-9]", "") on every integer config read. Each call recompiles the regex. Extracting the pattern to a private static final Pattern field eliminates repeated compilation.

Change: Added NON_DIGIT_PATTERN static field and updated the call site to use it.