Add full Chain 138 integration: 8 steps, chain spec, app-ethereum config, docs

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

step-01-currency/README.md

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+# Step 1 — Currency
+
+Add the Chain 138 currency to `@ledgerhq/cryptoassets`.
+
+**In ledger-live repo:**
+
+1. Open `libs/ledgerjs/packages/cryptoassets/src/currencies.ts` (or `currencies.js`).
+2. Add the `defi_oracle_meta_mainnet` entry from `currencies.chain138.ts` to the cryptoassets map.
+3. If the repo uses a single flat object keyed by id, add: `defi_oracle_meta_mainnet: { ...defiOracleMetaMainnetCurrencyRaw }`.

step-01-currency/currencies.chain138.ts

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+/**
+ * Step 1 — Currency (Cryptoassets library)
+ * Target: ledger-live libs/ledgerjs/packages/cryptoassets/src/currencies.ts
+ * Add this entry to the cryptoassets map (merge with existing ethereum or add as new key).
+ *
+ * Chain 138: Defi Oracle Meta Mainnet
+ * @see https://developers.ledger.com/docs/ledger-live/accounts/integration/blockchain/cryptoassets-library
+ */
+
+export const defiOracleMetaMainnetCurrency = {
+  type: "CryptoCurrency",
+  id: "defi_oracle_meta_mainnet",
+  coinType: 60, // SLIP-44 Ethereum
+  name: "Defi Oracle Meta Mainnet",
+  managerAppName: "Ethereum",
+  ticker: "ETH",
+  countervalueTicker: "ETH",
+  scheme: "defi-oracle-meta",
+  color: "#627EEA",
+  family: "ethereum",
+  units: [
+    { name: "ETH", code: "ETH", magnitude: 18 },
+    { name: "wei", code: "wei", magnitude: 0 },
+  ],
+  ethereumLikeInfo: { chainId: 138 },
+  blockAvgTime: 2, // Chain 138 ~2s block time (Besu QBFT)
+  // disableCountervalue: true, // uncomment if fiat should not be shown
+  explorerViews: [
+    {
+      address: "https://explorer.d-bis.org/address/$address",
+      tx: "https://explorer.d-bis.org/tx/$hash",
+      token: "https://explorer.d-bis.org/token/$contractAddress?a=$address",
+    },
+  ],
+} as const;
+
+// Plain object form for JSON/currencies.js style (if repo uses .js)
+export const defiOracleMetaMainnetCurrencyRaw = {
+  type: "CryptoCurrency",
+  id: "defi_oracle_meta_mainnet",
+  coinType: 60,
+  name: "Defi Oracle Meta Mainnet",
+  managerAppName: "Ethereum",
+  ticker: "ETH",
+  countervalueTicker: "ETH",
+  scheme: "defi-oracle-meta",
+  color: "#627EEA",
+  family: "ethereum",
+  units: [
+    { name: "ETH", code: "ETH", magnitude: 18 },
+    { name: "wei", code: "wei", magnitude: 0 },
+  ],
+  ethereumLikeInfo: { chainId: 138 },
+  blockAvgTime: 2,
+  explorerViews: [
+    {
+      address: "https://explorer.d-bis.org/address/$address",
+      tx: "https://explorer.d-bis.org/tx/$hash",
+      token: "https://explorer.d-bis.org/token/$contractAddress?a=$address",
+    },
+  ],
+} as const;