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

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

step-08-manual-tests/README.md

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+# Step 8 — Manual tests
+
+- **test-plan.md** — Full send/receive test plan (sync, receive, balance, broadcast, operations, account). Check off each item after testing in Ledger Wallet.
+- **run-checklist.sh** — Prints the checklist to the terminal. Run: `chmod +x run-checklist.sh && ./run-checklist.sh`.
+
+Complete these tests before considering the integration done or before submitting to Ledger.

step-08-manual-tests/run-checklist.sh

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+#!/usr/bin/env bash
+# Step 8 — Manual test checklist runner (prints steps; no automation)
+# Usage: ./run-checklist.sh
+
+set -e
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+echo "=== Ledger Chain 138 Manual Test Checklist ==="
+echo "Run each item in Ledger Wallet (desktop or mobile) with Defi Oracle Meta Mainnet."
+echo ""
+cat "${SCRIPT_DIR}/test-plan.md"
+echo ""
+echo "=== End of checklist ==="

step-08-manual-tests/test-plan.md

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+# Step 8 — Send/Receive Manual Test Plan
+
+**Source:** [Ledger Manual tests](https://developers.ledger.com/docs/ledger-live/accounts/integration/blockchain/test-plan)
+
+Execute after Chain 138 is added to Ledger Wallet (LLD/LLM). Use a Ledger device with Ethereum app and Chain 138 configured.
+
+---
+
+## Synchronization
+
+- [ ] Add an account (Defi Oracle Meta Mainnet)
+- [ ] Migrate an account: Add an account in prod, don’t crash using tested version
+- [ ] Synchronizing manually does not throw an error (green check)
+- [ ] Synchronizing of a big account (multiple pages when fetching history)
+
+## Receive / Address verification
+
+- [ ] Users can verify their address with the nano
+- [ ] Users can verify their address without the nano
+
+## Balance
+
+- [ ] Available balance is right
+
+## Broadcast
+
+- [ ] Send max operation empties the account
+- [ ] Send operation sends the right amount
+- [ ] Users cannot send more than their balance
+
+## Operations
+
+- [ ] Optimistic operation is filled correctly
+- [ ] Operation history has every transaction of the account
+- [ ] Operation has the right transaction ID
+- [ ] User can reach the tx details by clicking on “View on explorer”
+- [ ] Operation account is right
+
+## Account details
+
+- [ ] Fiat value fetched from countervalues is right (if enabled)
+- [ ] Users can favorite their account and it is shown