refactor: update LNBits migration to use configuration object

- Replaced SQL statements with a configuration object for LNBits settings, enhancing code clarity and maintainability.
- Simplified the migration process by utilizing the saveConfig function for applying configurations.
- Marked the down migration as a no-op to prevent breaking existing configurations.

packages/server/migrations/1750000000000-add-lnbits-config.js

@@ -1,34 +1,17 @@
-const db = require('./db')
+const { saveConfig } = require('../lib/new-settings-loader')
 
 exports.up = function (next) {
-  const sql = [
-    `INSERT INTO user_config (name, display_name, type, data_type, config_type, enabled, secret, options)
-     VALUES 
-       ('lnbitsEndpoint', 'LNBits Server URL', 'text', 'string', 'wallets', false, false, null),
-       ('lnbitsAdminKey', 'LNBits Admin Key', 'text', 'string', 'wallets', false, true, null)
-     ON CONFLICT (name) DO NOTHING`,
-    
-    `INSERT INTO user_config (name, display_name, type, data_type, config_type, enabled, secret, options)
-     VALUES 
-       ('LN_wallet', 'Lightning Network Wallet', 'text', 'string', 'wallets', true, false, 
-        '[{"code": "lnbits", "display": "LNBits"}, {"code": "galoy", "display": "Galoy (Blink)"}, {"code": "bitcoind", "display": "Bitcoin Core"}]')
-     ON CONFLICT (name) 
-     DO UPDATE SET options = EXCLUDED.options
-     WHERE user_config.options NOT LIKE '%lnbits%'`
-  ]
+  const config = {
+    'lnbits_endpoint': '',
+    'lnbits_adminKey': '',
+    'LN_wallet': 'lnbits'
+  }
 
-  db.multi(sql, next)
+  saveConfig(config).then(next).catch(next)
 }
 
 exports.down = function (next) {
-  const sql = [
-    `DELETE FROM user_config 
-     WHERE name IN ('lnbitsEndpoint', 'lnbitsAdminKey')`,
-    
-    `UPDATE user_config 
-     SET options = REPLACE(options, ', {"code": "lnbits", "display": "LNBits"}', '')
-     WHERE name = 'LN_wallet'`
-  ]
-
-  db.multi(sql, next)
+  // No-op - removing config entries is not typically done in down migrations
+  // as it could break existing configurations
+  next()
 }