Create a Minecraft Java 1.21+ datapack that adds a custom item called "Crystal Pickaxe". This item must behave like the Donut SMP Shard (Amethyst) Pickaxe with 3x3 mining, but with the following exact specifications: MAIN FEATURES: - Name: Crystal Pickaxe - Base appearance: Netherite Pickaxe (same model and texture as a Netherite pickaxe) - Enchanted visual glow: YES (always looks like a Netherite pickaxe with enchantments) - Mining ability: breaks blocks in a 3x3 area (9 blocks total) centered on the mined block - Works with Silk Touch correctly on all compatible blocks - Same mining speed as a Netherite Pickaxe with Efficiency V ENCHANTMENTS: - Silk Touch I (always applied) - Efficiency V (always applied) - The item MUST NOT have Unbreaking or Mending ENCHANTMENT RESTRICTIONS: - Players must NOT be able to add Mending or Unbreaking III via anvils, enchanting table, commands, loot tables, villager trades, or any other vanilla method - If Mending or Unbreaking is somehow added, the datapack must automatically remove them immediately DURABILITY SYSTEM: - The Crystal Pickaxe has the SAME durability as a Diamond Pickaxe (1561 durability) - It is NOT unbreakable - It must lose durability normally when mining blocks - It must break when durability reaches 0 DISENCHANTING: - The Crystal Pickaxe cannot be fully disenchanted using a grindstone - The grindstone must NOT remove its custom properties or downgrade it into a normal item - If necessary, the datapack should restore the item after grindstone interaction COMPATIBILITY: - Minecraft Java Edition 1.21+ - Fully datapack-based (no mods) - Multiplayer compatible IMPLEMENTATION REQUIREMENTS: - Include all necessary functions, tags, predicates, advancements, loot tables, and pack.mcmeta - Clean, optimized, and server-friendly implementation - Ensure 3x3 mining works reliably in multiplayer without duplication bugs