Add SimpleSwap swap support

[andreykr-simpleswap]

CHANGELOG

Does this branch warrant an entry to the CHANGELOG?

• Yes

Dependencies

none

Description

Context

This PR adds SimpleSwap (https://simpleswap.io) as a centralized swap
provider. We're the SimpleSwap engineering team — the plugin is built
against our public API v3, following CREATING_AN_EXCHANGE_PLUGIN.md and
the central template.

Changes

• src/swap/central/simpleswap.ts — the plugin. Tries a fixed-rate
  quote first and falls back to a float rate. Supports both quote
  directions, checks limits via our ranges endpoint before creating an
  order, and maps API errors to the Edge error types. max quotes use
  a local probe for fee estimation, so no orders are created and
  abandoned along the way.
• Chain mappings under src/mappings/ and a synchronizer under
  scripts/, generated from our live currency list with mapctl.
• Plugin registration in src/index.ts.
• test/simpleswap.test.ts — covers the mapping for every
  EdgeCurrencyPluginId, both quote directions, limit errors, the
  fixed-to-float fallback, currency code transcription, and the max
  path.

Init options: SIMPLESWAP_INIT: { "apiKey": "..." }. The factory
throws on an empty key, so builds without the key just skip the plugin.

Verification

• npm run verify passes.
• Quotes and order creation tested end to end against our sandbox in
  both directions: deposit addresses and order URIs come back correct.
• Ran the full app from edge-react-gui in the iOS simulator: the plugin
  builds, shows up in Exchange Settings, quotes btc->eth and creates
  live orders on the sandbox.

---

Note

Medium Risk
New third-party swap path handles real deposits, refunds, and memos; mistakes in mappings or amount handling could misroute funds, though patterns match existing CEX plugins and tests cover key flows.

Overview
Adds SimpleSwap as a new centralized swap provider (simpleswap), wired into the plugin registry and mapctl tooling.

The plugin calls SimpleSwap API v3 (ranges, estimates, exchanges) with x-api-key, maps Edge chains via generated mappings, and transcribes tickers where they differ (e.g. BNB → bnb-bsc). Quotes prefer fixed rates and fall back to float when fixed fails with currency/limit errors; API 403 becomes SwapPermissionError, and 404/422 become SwapCurrencyError. Max swaps use a local fee probe (skipChecks, spend-to-self) so only one live order is created.

Also adds a mapctl synchronizer (SIMPLESWAP_API_KEY, live /v3/currencies), large simpleswapMappings / auto-generated src/mappings/simpleswap.ts, CHANGELOG entry, and test/simpleswap.test.ts for mappings, quote flows, limits, fallbacks, and max-quote behavior.

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