chore: metamask networks, explorer SPA, nginx scripts; ignore Python cache

- Dual-chain / GRU deployment JSON sync
- Frontend explorer SPA + MetaMask components
- Scripts: nginx fixes, link deploy, local SPA serve helper
- Token icon chain-138.png; .gitignore __pycache__

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/components/common/EntityBadge.tsx

@@ -13,8 +13,14 @@ function toneClasses(tone: 'neutral' | 'success' | 'warning' | 'info') {
   }
 }
 
-export function getEntityBadgeTone(tag: string): 'neutral' | 'success' | 'warning' | 'info' {
-  const normalized = tag.toLowerCase()
+function normalizeBadgeLabel(value: unknown): string {
+  if (typeof value === 'string') return value
+  if (typeof value === 'number' || typeof value === 'bigint' || typeof value === 'boolean') return String(value)
+  return 'unknown'
+}
+
+export function getEntityBadgeTone(tag: unknown): 'neutral' | 'success' | 'warning' | 'info' {
+  const normalized = normalizeBadgeLabel(tag).toLowerCase()
   if (normalized === 'compliant' || normalized === 'listed' || normalized === 'verified' || normalized === 'gru') {
     return 'success'
   }
@@ -27,15 +33,16 @@ export function getEntityBadgeTone(tag: string): 'neutral' | 'success' | 'warnin
   return 'neutral'
 }
 
-export function formatEntityBadgeLabel(label: string): string {
-  const normalized = label.toLowerCase()
+export function formatEntityBadgeLabel(label: unknown): string {
+  const resolvedLabel = normalizeBadgeLabel(label)
+  const normalized = resolvedLabel.toLowerCase()
   const labels: Record<string, string> = {
     'reference-asset': 'reference asset',
     'electronic-money': 'cash e-money',
     'treasury-bond': 'treasury / gov bond',
     gru: 'GRU',
   }
-  return labels[normalized] || label
+  return labels[normalized] || resolvedLabel
 }
 
 export default function EntityBadge({
@@ -43,7 +50,7 @@ export default function EntityBadge({
   tone,
   className,
 }: {
-  label: string
+  label: unknown
   tone?: 'neutral' | 'success' | 'warning' | 'info'
   className?: string
 }) {