feat(i18n, config): enhance agent management localization and add settings/currencies hub cards

Added new agent-related translation keys across English, Nepali, and Chinese including agentCode, agentName, loginUsername, and detailTabs. Enhanced agent console hints for child creation permissions and line root profile read-only states. Added validation error messages for share/rebate parent limits and username charset validation. Introduced common status labels (enabled/disabled) and yes/no/none text

src/i18n/locales/en/config.json

@@ -54,6 +54,8 @@
     "description": "Jump to play rules, odds & rebate, jackpot, and risk cap by domain. The sidebar provides direct links; this page is an overview.",
     "integrationDesc": "site_code, JWT secrets, partner wallet URL, iframe allowlist",
     "integrationTitle": "Integration sites",
+    "currenciesDesc": "Manage supported currencies and precision",
+    "currenciesTitle": "Currencies",
     "jackpotDesc": "Pool parameters and ledger records",
     "jackpotTitle": "Jackpot",
     "oddsDesc": "Odds matrix and base rebate in one version stream",
@@ -62,6 +64,8 @@
     "playsTitle": "Play rules",
     "riskCapDesc": "Per-number payout caps and occupancy",
     "riskCapTitle": "Risk cap rules",
+    "settingsDesc": "Payout, rebate, and other system-level parameters",
+    "settingsTitle": "System settings",
     "title": "Operations configuration"
   },
   "integrationSites": {