Added

• PlaceholderAPI support for mana so scoreboard plugins can display mana on the right side
• New placeholders:
  • %sololeveling999_mana%
  • %sololeveling999_mana_current%
  • %sololeveling999_mana_max%
  • %sololeveling999_mana_percent%

Changed

• Added mana.display: NONE mode to fully hide mana UI (no action bar or boss bar)
• Expanded config.yml comments to better explain each configuration section and key values
• Plugin metadata now marks PlaceholderAPI as an optional soft dependency