WIP - Issue5164 - open backend sources (2fa, multisig, invoices)

[shendel]

Checklist

• [ ] I have read the CONTRIBUTING guide
• [ ] Good naming (as clear and simple as possible)
• [ ] Correct behavior if external API endpoints are down, return 404, 504 (or no answer), 401 errors (ddos simulation)
• [ ] I tested desktop/mobile resolution
• [ ] I tested light/dark theme
• [ ] I tested different languages
• [ ] I checked the functionality once again (AFFECT MONEY)
• [ ] I checked the work on the Testnet
• [ ] I checked the work on the Mainnet
• [ ] I checked the work in the plugin
• [ ] I checked the PR once again

Tests

Please start auto tests as follows:

• add a label swap test to start swap tests
• add a label withdraw test to start withdraw tests

You can skip these tests if you completely sure that your changes aren't related to this functional

Original issue

https://github.com/swaponline/MultiCurrencyWallet/issues/5164

Video / screenshot proof

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