Sumsub: Feat - Add Device Intelligence support

[cmgustavo]

Adds client-side SumSub Device Intelligence (via @sumsub/fisherman).

• src/lib/sumsub/deviceIntelligence.ts — captureDeviceIntelligence({network}): gets the
  Unique Device ID, obtains a DI access token, initializes fisherman and returns the
  visitorId.
• Token strategy (no secret key in the app): DEV uses a local token from
  scripts/get-sumsub-di-token.js (sandbox, simulation mode); PROD fetches the token
  from the BitPay backend (stubbed — endpoint TBD) so it's minted server-side.
• src/Root.tsx — calls it on startup (temporary demo).
• docs/sumsub-device-intelligence-plan.md — check comments.

Notes

• Runs in bare React Native (no WebView needed).
• The SumSub sandbox is in simulation mode (no real FingerprintJS apiKey), so testing uses
  simulationConfig (visitorId = Device ID + all supported riskLabels). Verified
  end-to-end: token minted, fingerprint() → { visitorId }, risk labels reported.
• SUMSUB_DI_DEV_TOKEN is committed empty.