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

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

step-03-coin-module/config.chain138.ts

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+/**
+ * Step 3 — Create coin module (config for Ethereum family + Chain 138)
+ * Target: ledger-live libs/coin-modules (or extend libs/ledger-live-common/src/families/ethereum)
+ *
+ * For Chain 138 we extend the Ethereum family. This config is used by the bridge/network.
+ */
+
+export const CHAIN_ID = 138 as const;
+
+export const RPC_URLS = [
+  "https://rpc-http-pub.d-bis.org",
+  "https://rpc.d-bis.org",
+  "https://rpc2.d-bis.org",
+  "https://rpc.public-0138.defi-oracle.io",
+  "https://rpc.defi-oracle.io",
+] as const;
+
+export const EXPLORER_BASE = "https://explorer.d-bis.org" as const;
+
+export const chain138Config = {
+  chainId: CHAIN_ID,
+  rpcUrls: RPC_URLS,
+  explorer: {
+    address: `${EXPLORER_BASE}/address/$address`,
+    tx: `${EXPLORER_BASE}/tx/$hash`,
+    token: `${EXPLORER_BASE}/token/$contractAddress?a=$address`,
+  },
+} as const;