Add SimpleSwap swap support

[j0ntz]

CHANGELOG

Does this branch warrant an entry to the CHANGELOG?

• Yes
• No

Dependencies

EdgeApp/edge-exchange-plugins#488: the SimpleSwap plugin itself. This PR only registers it, so it is inert until that lands and publishes.

Requirements

If you have made any visual changes to the GUI. Make sure you have:

• Tested on iOS device
• Tested on Android device
• Tested on small-screen device (iPod Touch)
• Tested on large-screen device (tablet)

Description

Asana: https://app.asana.com/0/1215088146871429/1217205278669378

Registers SimpleSwap, the swap provider added in
EdgeApp/edge-exchange-plugins#488,
so the plugin loads in the app. This is SimpleSwap's own wiring from
#6136, recreated on an
EdgeApp branch so it can land from here, with their authorship on the commit.

• src/envConfig.ts carries SIMPLESWAP_INIT with an apiKey, matching the other
  centralized providers. An empty key makes the plugin factory throw, so builds
  without the key skip SimpleSwap entirely.
• src/util/corePlugins.ts carries the swapPlugins entry.
• src/components/modals/SwapVerifyTermsModal.tsx carries the terms, privacy
  and AML/KYC links shown before the first SimpleSwap quote.
• src/actions/CategoriesActions.ts and src/constants/MerchantContacts.ts carry
  the provider icon and merchant contact.

The icon at content.edge.app/simpleswap.png is not on the content server yet,
so the provider row renders a broken image until it is uploaded. SimpleSwap
attached the 64x64 and 600x210 assets, at 1x and 2x, to
#6136.

Testing

Driven on the iOS simulator against the real SimpleSwap API, with every other
swap provider disabled locally so the engine had to route through SimpleSwap: an
80 XLM to XMR swap from My Stellar executed to the success scene, and the
Stellar send carried SimpleSwap's numeric deposit memo. The plugin's below-limit
error also renders correctly ("Amount is below the min limit of 66.9549714 XLM").
Screenshots below.

---

Note

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[j0ntz]

📸 Test evidence

simpleswap terms modal

simpleswap quote

swap success

xlm tx with memo

stellar broadcast

Captured by the agent's in-app test run (build-and-test).

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