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

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

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