docs(nodes): restore exchange withdrawal submission

[TheJudii]

Summary

• restore signed transaction submission for exchange API nodes with api-accept-transactions = true
• distinguish the transaction-accepting exchange profile from node-template's hardened read-only API and SHiP profiles
• remove the redundant explicit eosio::producer_plugin entry and clarify that only producer_api_plugin is temporarily enabled for snapshots
• restrict transaction write endpoints to authenticated, allowlisted exchange systems at the reverse proxy

Root cause

PR #246 changed the shared exchange API configuration to api-accept-transactions = false while retaining the Path A instructions for submitting withdrawals through push_transaction / send_transaction. TelosZero rejects those read/write API calls when transaction acceptance is disabled.

Impact

Path A, and Path B when built from the shared configuration, can once again relay valid signed withdrawal transactions. The documentation now clearly separates this private exchange role from public read-only API profiles.

Validation

• git diff --check
• full Docusaurus production build with yarn build

The build succeeds with the repository's existing unrelated broken-link and broken-anchor warnings.

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