feat(admin): add module settings to toggle trading feature

Introduce module_settings table to store global feature flags
Add admin UI to enable or disable the Trading module
Hide trading-related UI and skip data fetching when disabled

system-wordings.ts

@@ -1142,6 +1142,8 @@ export const systemWordingMessages = {
         languages: 'Languages',
         newConfig: 'New {name}',
         editConfig: 'Edit {name}',
+        moduleSettings: 'Module settings',
+        tradingModule: 'Trading',
         hasItemDrop: 'Has item drop',
         hasTrading: 'Has trading',
         opposite: 'Opposite',
@@ -2572,6 +2574,8 @@ export const systemWordingMessages = {
         languages: '语言',
         newConfig: '新增{name}',
         editConfig: '编辑{name}',
+        moduleSettings: '模块设置',
+        tradingModule: 'Trading',
         hasItemDrop: '有掉落物',
         hasTrading: '有 Trading',
         opposite: '反义词',