docs: Ledger Live integration, contract deploy learnings, NEXT_STEPS updates

- ADD_CHAIN138_TO_LEDGER_LIVE: Ledger form done; public code review repo bis-innovations/LedgerLive; init/push commands
- CONTRACT_DEPLOYMENT_RUNBOOK: Chain 138 gas price 1 gwei, 36-addr check, TransactionMirror workaround
- CONTRACT_*: AddressMapper, MirrorManager deployed 2026-02-12; 36-address on-chain check
- NEXT_STEPS_FOR_YOU: Ledger done; steps completable now (no LAN); run-completable-tasks-from-anywhere
- MASTER_INDEX, OPERATOR_OPTIONAL, SMART_CONTRACTS_INVENTORY_SIMPLE: updates
- LEDGER_BLOCKCHAIN_INTEGRATION_COMPLETE: bis-innovations/LedgerLive reference

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

phoenix-deploy-api/.env.example

@@ -0,0 +1,17 @@
+# =============================================================================
+# Phoenix Deploy API — Environment (example)
+# =============================================================================
+# Copy to .env and fill in. Do not commit .env.
+# See README.md for Gitea webhook and deploy endpoint usage.
+# =============================================================================
+
+# Listen port
+PORT=4001
+
+# Gitea instance (for commit status API)
+GITEA_URL=https://gitea.d-bis.org
+# Token with repo (or repo:status) scope — create at Gitea → Settings → Applications
+GITEA_TOKEN=your-gitea-token
+
+# Optional: shared secret for webhook signature and /api/deploy Bearer auth
+# PHOENIX_DEPLOY_SECRET=your-webhook-and-deploy-secret