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

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

step-06-lld-llm/setup.chain138.ts

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+/**
+ * Step 6 — LLD & LLM: live-common family setup (snippet for Chain 138)
+ * Target: ledger-live libs/ledger-live-common/src/families/ethereum/setup.ts
+ * (or new family libs/ledger-live-common/src/families/defi_oracle_meta/setup.ts)
+ *
+ * Merge Chain 138 into Ethereum family setup: ensure getCryptoCurrencyById("defi_oracle_meta_mainnet")
+ * (or ethereum with chainId 138 in config) is supported and bridge/resolver use the same signer.
+ *
+ * Example shape (simplified; actual ledger-live uses createBridges, executeWithSigner, etc.):
+ */
+
+/*
+import { getCryptoCurrencyById } from "@ledgerhq/cryptoassets/currencies";
+import Transport from "@ledgerhq/hw-transport";
+import Eth from "@ledgerhq/hw-app-eth";
+import type { Bridge } from "@ledgerhq/types-live";
+import { createResolver, executeWithSigner } from "../../bridge/setup";
+import myCoinResolver from "@ledgerhq/coin-ethereum/signer/index"; // or your coin-module
+
+const createSigner = (transport: Transport) => new Eth(transport);
+
+const currency = getCryptoCurrencyById("defi_oracle_meta_mainnet");
+const getCurrencyConfig = () => getCurrencyConfiguration(currency);
+
+const bridge: Bridge<...> = createBridges(
+  executeWithSigner(createSigner),
+  getCurrencyConfig
+);
+const resolver = createResolver(createSigner, myCoinResolver);
+
+export { bridge, resolver, cliTools };
+*/
+
+export const SETUP_CURRENCY_ID = "defi_oracle_meta_mainnet";
+export const SETUP_SIGNER_CREATOR = "createSigner: (transport) => new Eth(transport)";