Create a Minecraft Paper plugin (1.21+) that adds an unbreakable Gold Chestplate with the following mechanics and no custom name or lore. While worn, the player passively gains Haste II and Speed III, which are removed when the chestplate is taken off. When the player crouches and left-clicks, 6 lightning strikes hit in a circle around the player with a 5-block radius, each dealing 6.5 hearts of damage that ignores armor. Additionally, when hitting any entity, there is a 15% chance to summon a normal lightning strike dealing 2.5 hearts that also ignores armor. Include a config.yml to allow server owners to adjust passive effects, radius, damage values, lightning chance, and enable/disable options. The chestplate must be unbreakable and identified with a persistent data tag so it cannot be faked.