feat: add BTCPay wallet connection

[ben-kaufman]

Description

This PR:

1. Adds BTCPay setup-link handling from scanner paste and deep links, with a review sheet before connecting.
2. Registers the current wallet's on-chain descriptor through BitkitCore 0.1.60, using the selected address type at connection time.
3. Adds response parsing, local-development HTTP handling, safer deep-link logging, localization, and focused setup parsing coverage.

Linked Issues/Tasks

N/A

Screenshot / Video

bitkit-btcpay-samrock-e2e-proof-framed-20260521.webm

QA Notes

Manual Tests

• 1. BTCPay store -> setup QR -> Bitkit Scanner paste: Connect BTCPay sheet opens with the store host and requested methods.
• 2. Connect BTCPay sheet -> Connect: setup completes, the sheet closes, and a success toast is shown.
• 3. Bitkit Receive -> BTCPay BTC wallet address list: the receive address shown in Bitkit matches the address derived by BTCPay.
• 4. regression: Scanner -> paste a non-BTCPay QR: existing scanner routing still handles the QR normally.

Automated Checks

• git diff --cached --check
• SwiftFormat run on touched Swift files.
• Swift parse check passed for touched Swift files.
• plutil -lint Bitkit/Resources/Localization/en.lproj/Localizable.strings
• Old-Xcode E2E simulator build passed with E2E_BUILD, E2E_BACKEND=network, E2E_NETWORK=regtest, and BitkitCore 0.1.60.
• Unit tests added: cover setup URL parsing, selected address type mapping, local HTTP handling, and response parsing in BitkitTests/SamRockSetupRequestTests.swift.
• node scripts/validate-translations.js is currently blocked locally by the missing glob package.

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[jvsena42]

code LGTM, testing...

[jvsena42]

Tested on local regtest server

• Connect to wallet
• Get and address from BTC pay server
• Pay

Simulator.Screen.Recording.-.iPhone.SE.3rd.generation.-.2026-05-26.at.14.56.44.mp4

[ovitrif]

utAck

Depending on which PR gets merged first, this one might need update to Bitkit-core 64 if merging later than the ones set on auto-merge. For that reason I won't set this to auto-merge, there will be conflicts in there anyways whichever goes first.