Add WalletConnect stub, track surfaces, legacy SPA retirement, and dual-domain checks.

Publish walletconnect config endpoints, Track 3/4 notes on analytics/operator pages, legacy SPA at /legacy/index.html with root redirect, and a parity verifier for explorer.d-bis.org vs blockscout.defi-oracle.io.

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

frontend/src/data/explorerOperations.ts

@@ -11,6 +11,8 @@ export interface ExplorerFeaturePage {
   title: string
   description: string
   note?: string
+  accessTrack?: number
+  accessNote?: string
   actions: ExplorerFeatureAction[]
 }
 
@@ -141,6 +143,9 @@ export const explorerFeaturePages = {
     description:
       'Use the public explorer pages and live monitoring endpoints as the visible analytics surface for chain activity, recent blocks, and transaction flow.',
     note: sharedOperationsNote,
+    accessTrack: 3,
+    accessNote:
+      'This page is the public Track 3 analytics surface. Wallet-authenticated Track 3 APIs remain available after browser wallet sign-in.',
     actions: [
       {
         title: 'Blocks',
@@ -175,6 +180,9 @@ export const explorerFeaturePages = {
     description:
       'Expose the public operator surface for bridge checks, route validation, planner providers, liquidity entry points, and documentation.',
     note: sharedOperationsNote,
+    accessTrack: 4,
+    accessNote:
+      'This page is the public Track 4 operator surface. Sensitive operator write APIs remain gated behind wallet auth and operator policy.',
     actions: [
       {
         title: 'Bridge monitoring',
@@ -334,6 +342,16 @@ export const explorerOperationsSurfaces: ExplorerOperationsSurface[] = [
     label: 'System',
     description: 'Networks, RPC methods, and topology inventory.',
   },
+  {
+    href: '/analytics',
+    label: 'Analytics',
+    description: 'Track 3 activity summaries, trends, and freshness context.',
+  },
+  {
+    href: '/operator',
+    label: 'Operator',
+    description: 'Track 4 relay, route, and planner shortcuts.',
+  },
 ]
 
 export const explorerPublicApiLinks = [
@@ -357,4 +375,9 @@ export const explorerPublicApiLinks = [
     label: 'Wallet networks',
     description: 'Published chain metadata for wallet onboarding.',
   },
+  {
+    href: '/explorer-api/v1/walletconnect/config',
+    label: 'WalletConnect config',
+    description: 'Published WalletConnect v2 posture and browser-auth fallback.',
+  },
 ] as const