refactor(i18n): move GUI files to gui/ subfolder and convert to MiniMessage format

Reorganize translation files into gui/ subdirectory for better structure.
Convert all legacy section sign color codes to MiniMessage tags across
all properties files (npcs, scoreboard, tablist, and all GUI files).

Author: Swofty-Developments

configuration/i18n/en_US/gui/gui_auction.properties

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+# ============================================================
+# Banker GUI - Extracted UI strings
+# Source: type.skyblockgeneric/gui/inventories/banker/
+# ============================================================
+
+# --- GUIBanker ---
+gui_banker.main.title = Bank
+gui_banker.main.title_personal = Personal Bank Account
+gui_banker.main.title_coop = Co-op Bank Account
+gui_banker.main.processing_transactions = <red>You currently have processing transactions!
+gui_banker.main.processing_wait = <red>Please wait a moment before accessing your bank account.
+gui_banker.main.information = <green>Information
+gui_banker.main.information.lore = <gray>Keep your coins safe in the bank!\n<gray>You lose half the coins in your purse when dying in combat.\n \n<gray>Balance limit: <gold>{limit} Coins\n \n<gray>The banker rewards you every 31\n<gray>hours with <aqua>interest <gray>for the coins in your bank balance.\n<gray> \n<gray>Interest is in: <aqua>{hours}h
+gui_banker.main.deposit = <green>Deposit Coins
+gui_banker.main.deposit.lore = <gray>Current balance: <gold>{balance}\n \n<gray>Store coins in the bank to keep\n<gray>them safe while you go on\n<gray>on adventures!\n \n<gray>You will earn <aqua>2%<gray> interest every\n<gray>season for your first <gold>10 million\n<gray>banked coins.\n \n<gray>Until interest: <aqua>{hours}h\n \n<yellow>Click to make a deposit!
+gui_banker.main.withdraw = <green>Withdraw Coins
+gui_banker.main.withdraw.lore = <gray>Current balance: <gold>{balance}\n \n<gray>Withdraw coins from the bank\n<gray>to use them for trading or\n<gray>other purposes!\n \n<yellow>Click to make a withdrawal!
+gui_banker.main.recent_transactions = <green>Recent Transactions
+gui_banker.main.no_transactions = <red>No transactions yet!
+gui_banker.main.transaction_entry = <gray>{sign} <gold>{amount}<gray>, <yellow>{time_ago}<gray> by <aqua>{originator}
+
+# --- GUIBankerDeposit ---
+gui_banker.deposit.title = Bank Deposit
+gui_banker.deposit.whole_purse = <green>Your whole purse
+gui_banker.deposit.whole_purse_subtitle = <dark_gray>Bank deposit
+gui_banker.deposit.current_balance = <gray>Current balance: <gold>{balance}
+gui_banker.deposit.amount_to_deposit = <gray>Amount to deposit: <gold>{amount}
+gui_banker.deposit.click = <yellow>Click to deposit coins!
+gui_banker.deposit.half_purse = <green>Half of your purse
+gui_banker.deposit.custom_amount = <green>Custom amount
+gui_banker.deposit.custom_amount_label = <gray>Amount to deposit: <gold>Custom
+gui_banker.deposit.not_enough_coins = <red>You do not have that many coins to deposit!
+gui_banker.deposit.invalid_amount = <red>You cannot deposit that amount!
+gui_banker.deposit.invalid_number = <red>That is not a valid number!
+gui_banker.deposit.exceed_limit = <red>You cannot deposit that much, you would exceed your balance limit of <gold>{limit} coins<red>!
+gui_banker.deposit.depositing = <dark_gray>Depositing coins...
+gui_banker.deposit.success = <green>You have deposited <gold>{amount} coins<green>! You now have <gold>{balance} coins<green> in your account.
+gui_banker.deposit.coop_busy = <red>You cannot deposit coins as your coop members are currently using the bank.
+
+# --- GUIBankerWithdraw ---
+gui_banker.withdraw.title = Bank Withdrawal
+gui_banker.withdraw.everything = <green>Everything in the account
+gui_banker.withdraw.everything_subtitle = <dark_gray>Bank withdrawal
+gui_banker.withdraw.current_balance = <gray>Current balance: <gold>{balance}
+gui_banker.withdraw.amount_to_withdraw = <gray>Amount to withdraw: <gold>{amount}
+gui_banker.withdraw.click = <yellow>Click to withdraw coins!
+gui_banker.withdraw.half_account = <green>Half of the account
+gui_banker.withdraw.twenty_percent = <green>20% of the account
+gui_banker.withdraw.custom_amount = <green>Custom amount
+gui_banker.withdraw.not_enough_coins = <red>You do not have that many coins to withdraw!
+gui_banker.withdraw.invalid_amount = <red>You cannot withdraw that amount!
+gui_banker.withdraw.invalid_number = <red>That is not a valid number!
+gui_banker.withdraw.withdrawing = <dark_gray>Withdrawing coins...
+gui_banker.withdraw.success = <green>You have withdrawn <gold>{amount} coins<green>! You now have <gold>{balance} coins<green> in your account.
+gui_banker.withdraw.coop_busy = <red>You cannot withdraw coins as your coop members are currently using the bank.

configuration/i18n/en_US/gui/gui_banker.properties

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+# Common GUI elements shared across many GUIs
+
+gui_common.close = <red>Close
+gui_common.go_back = <green>Go Back
+gui_common.go_back.lore = <gray>To {gui_title}
+gui_common.click_to_view = <yellow>Click to view!
+gui_common.click_to_open = <yellow>Click to open!
+gui_common.click_to_select = <yellow>Click to select!
+gui_common.click_to_confirm = <yellow>Click to confirm!
+gui_common.click_to_browse = <yellow>Click to browse!
+gui_common.loading = <gray>Loading...
+gui_common.previous_page = <yellow>Previous Page
+gui_common.next_page = <yellow>Next Page
+gui_common.search = <green>Search
+gui_common.confirm = <green>Confirm
+gui_common.cancel = <red>Cancel