feat(portal): wire DashboardPage to live Chain-138 RPC + SolaceScan Explorer

- Add services/{http,chain138,explorer,proxmox,dbisCore} + hooks/{useLiveChain,useOnChainBalances}
- Add BackendStatusBar + LiveNetworkPanel components on DashboardPage
- Overlay on-chain META balance on account rows carrying a walletAddress
- Normalize EIP-55 checksum in chain138.getNativeBalance so hand-typed
  sample custody addresses (e.g. 0x742d35Cc...bD38) don't silently drop
  out of the balance map
- Default RPC: https://rpc.d-bis.org (user-preferred gateway)
- proxmox.ts stays mocked (CF-Access, needs BFF); dbisCore.ts stays
  mocked (no public deployment yet)

Co-Authored-By: Nakamoto, S <defi@defi-oracle.io>

src/config/endpoints.ts

@@ -0,0 +1,110 @@
+/**
+ * Central endpoint configuration for the Solace Bank Group PLC portal.
+ *
+ * All URLs can be overridden at build time via Vite env vars (VITE_*) so the
+ * same codebase can target staging / production / local mocks without a rebuild.
+ *
+ * Live backend status (verified 2026-04-19):
+ *   - chain138.rpc              LIVE (Besu QBFT, ChainID 138 / 0x8a)
+ *   - explorer.api              LIVE (SolaceScan / Blockscout v2; CORS *)
+ *   - proxmox.api               LIVE but CF-Access protected — browser calls
+ *                               cannot carry CF-Access JWTs without an SSO flow,
+ *                               so this is only reachable via a BFF today.
+ *   - dbisCore.api              NOT DEPLOYED (api.dbis-core.d-bis.org 404/DNS)
+ */
+
+export interface EndpointConfig {
+  chain138: {
+    rpcUrl: string;
+    chainId: number;
+    chainIdHex: `0x${string}`;
+    name: string;
+    nativeCurrency: { name: string; symbol: string; decimals: number };
+    blockExplorerUrl: string;
+  };
+  explorer: {
+    baseUrl: string;
+    apiBaseUrl: string; // Blockscout v2
+  };
+  proxmox: {
+    apiBaseUrl: string;
+    /** proxmox-api.d-bis.org is behind Cloudflare Access — direct browser calls
+     *  are blocked. Must be proxied through a BFF that holds a CF-Access
+     *  Service Token, or the user must complete CF-Access SSO in-browser. */
+    requiresBff: true;
+  };
+  dbisCore: {
+    apiBaseUrl: string;
+    /** dbis_core has no deployed public API yet. All methods fall back to
+     *  mock data with a console.warn. Flip this to `false` once the core
+     *  banking API is stood up. */
+    mocked: true;
+  };
+}
+
+const env = (import.meta as unknown as { env?: Record<string, string> }).env ?? {};
+
+export const endpoints: EndpointConfig = {
+  chain138: {
+    // Public gateway; `rpc-core.d-bis.org` is a working internal alias.
+    rpcUrl: env.VITE_CHAIN138_RPC_URL || 'https://rpc.d-bis.org',
+    chainId: 138,
+    chainIdHex: '0x8a',
+    name: 'DeFi Oracle Meta Mainnet',
+    nativeCurrency: { name: 'Meta', symbol: 'META', decimals: 18 },
+    blockExplorerUrl: env.VITE_EXPLORER_BASE_URL || 'https://explorer.d-bis.org',
+  },
+  explorer: {
+    baseUrl: env.VITE_EXPLORER_BASE_URL || 'https://explorer.d-bis.org',
+    apiBaseUrl: env.VITE_EXPLORER_API_BASE_URL || 'https://api.explorer.d-bis.org',
+  },
+  proxmox: {
+    apiBaseUrl: env.VITE_PROXMOX_API_BASE_URL || 'https://proxmox-api.d-bis.org',
+    requiresBff: true,
+  },
+  dbisCore: {
+    apiBaseUrl: env.VITE_DBIS_CORE_API_BASE_URL || 'https://api.dbis-core.d-bis.org',
+    mocked: true,
+  },
+};
+
+export type BackendStatus = 'live' | 'bff-required' | 'mocked' | 'degraded';
+
+export interface BackendDescriptor {
+  id: 'chain138' | 'explorer' | 'proxmox' | 'dbisCore';
+  name: string;
+  status: BackendStatus;
+  url: string;
+  note: string;
+}
+
+export const backendCatalog: BackendDescriptor[] = [
+  {
+    id: 'chain138',
+    name: 'Chain 138 RPC',
+    status: 'live',
+    url: endpoints.chain138.rpcUrl,
+    note: 'DeFi Oracle Meta Mainnet — Besu / QBFT. Read-only browser calls via ethers.',
+  },
+  {
+    id: 'explorer',
+    name: 'SolaceScan Explorer',
+    status: 'live',
+    url: endpoints.explorer.apiBaseUrl,
+    note: 'Blockscout v2 API. CORS * — safe for direct browser calls.',
+  },
+  {
+    id: 'proxmox',
+    name: 'Proxmox API',
+    status: 'bff-required',
+    url: endpoints.proxmox.apiBaseUrl,
+    note: 'Live but behind Cloudflare Access. Needs a BFF/service token; mocked in the browser.',
+  },
+  {
+    id: 'dbisCore',
+    name: 'DBIS Core Banking',
+    status: 'mocked',
+    url: endpoints.dbisCore.apiBaseUrl,
+    note: 'No public deployment yet. UI falls back to sample portal data.',
+  },
+];