Better MOTD 1.8.2

Performance

• Cache preset weight totals after config reload instead of recalculating them during normal ping handling.
• Cache static hover lines when no placeholders are present.
• Skip selection reason string creation on regular server-list pings; preview output still keeps reasons.

Build

• Remove unused bettermotd-logo.png from packaged resources.
• Exclude config.schema.json from runtime jars while keeping it in the repository.
• Disable Maven descriptor packaging (META-INF/maven/*) in plugin jars.
• Bump project version to 1.8.2.

Full Changelog: 1.8.1...1.8.2