Initial release

• Floating damage and heal numbers built from text display entities.
• Six number styles: normal, critical, fire, poison, projectile and heal.
• Particle bursts for each style.
• Per-player on/off switch that survives restarts.
• /damagepop command with toggle, on, off, status, demo and reload.
• Fully configurable formats (MiniMessage), size, animation, visibility range and performance limits.