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/components/explorer/OperationsPageShell.tsx

@@ -3,6 +3,7 @@ import { Card } from '@/libs/frontend-ui-primitives'
 import type { ExplorerFeaturePage } from '@/data/explorerOperations'
 import OperationsSurfaceNav from './OperationsSurfaceNav'
 import OperationsActionGrid from './OperationsActionGrid'
+import OperationsTrackNote from './OperationsTrackNote'
 
 export type StatusTone = 'normal' | 'warning' | 'danger'
 
@@ -108,6 +109,10 @@ export default function OperationsPageShell({
         </Card>
       ) : null}
 
+      {page.accessTrack && page.accessNote ? (
+        <OperationsTrackNote track={page.accessTrack} note={page.accessNote} />
+      ) : null}
+
       <OperationsSurfaceNav />
 
       {children}

frontend/src/components/explorer/OperationsTrackNote.tsx

@@ -0,0 +1,20 @@
+import { Card } from '@/libs/frontend-ui-primitives'
+
+export default function OperationsTrackNote({
+  track,
+  note,
+  className,
+}: {
+  track: number
+  note: string
+  className?: string
+}) {
+  return (
+    <Card className={className ?? 'mb-6 border border-violet-200 bg-violet-50/70 dark:border-violet-900/50 dark:bg-violet-950/20'}>
+      <div className="text-xs font-semibold uppercase tracking-[0.2em] text-violet-700 dark:text-violet-200">
+        Track {track} public surface
+      </div>
+      <p className="mt-2 text-sm leading-6 text-violet-950 dark:text-violet-100">{note}</p>
+    </Card>
+  )
+}

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

frontend/src/services/api/walletConnect.ts

@@ -0,0 +1,24 @@
+import { fetchPublicJson } from '@/utils/publicExplorer'
+
+const WALLETCONNECT_CONFIG_PATH = '/explorer-api/v1/walletconnect/config'
+
+export interface WalletConnectConfigResponse {
+  status: 'stub' | 'disabled' | string
+  enabled: boolean
+  projectId: string
+  relayUrl: string
+  metadataUrl: string
+  requiredNamespaces: string[]
+  supportedChains: number[]
+  fallbackAuth: string
+  message: string
+  updatedAt: string
+}
+
+export async function getWalletConnectConfig(): Promise<WalletConnectConfigResponse | null> {
+  try {
+    return await fetchPublicJson<WalletConnectConfigResponse>(WALLETCONNECT_CONFIG_PATH)
+  } catch {
+    return null
+  }
+}