Simple Vein Miner (Achievement Friendly)

This update is a complete rewrite following the One Punch Tree architecture. It introduces per-player configurable limits, a reset button, a proper custom config item, and fixes several bugs including the magnet toggle, redstone ore detection, and storage blocks incorrectly triggering the vein miner.

• 4 new sliders in the settings menu: Max Horizontal Spread (1–16), Max Blocks Up (1–32), Max Blocks Down (0–32), and Max Total Blocks (8–512).
• Each player saves their own values — changes made by one player don't affect others.
• Settings persist across sessions via dynamic properties.

• Added a ⚠ Reset to Defaults toggle at the bottom of the settings menu.
• Activating it restores all boolean options and sliders to their original values instantly, for that player only.

• Replaced the vanilla book with a proper custom item (svm:config).
• The item no longer relies on name tags or lore to identify itself — it's now a unique item type registered in items/config.json that opens the settings menu on use.
• Still given automatically on first spawn and kept on death.

• Dropped items are now pulled toward the vein center gradually instead of teleporting instantly, resulting in a more natural collection effect.
• A final full-attraction pass runs at the end of the job to ensure no items are left behind.

• Magnet toggle had no effect: items and XP were always spawned at the drop center regardless of the setting. Drops now spawn at each block's real position when the magnet is disabled.
• Redstone ore not detected as a vein: touching a redstone_ore converts it to lit_redstone_ore before the break event fires. Both variants are now normalized to the same ID so the vein propagates correctly.
• Storage blocks triggered the vein miner: isOre() was matching on substrings like diamond_block and gold_block. Detection is now limited to actual ores only.
• Efficiency enchantment benefit removed: efficiency was incorrectly reducing tool damage by 50% per block. Durability now only respects Unbreaking, matching vanilla behavior.
• Removed global gamerule showtags false that was being applied server-wide on every player spawn.
• Code split into modules: config.js, utils.js, ui.js, veinBreaker.js, main.js — following the same architecture as One Punch Tree for easier maintenance and future extensions.