feat(dev): add mobile testing infrastructure and environment fixes
- Add mobile testing targets to Makefile (adb port forwarding, ngrok)
- Fix PDS port configuration (3000→3001 for correct DID registration)
- Add AUTH_SKIP_VERIFY flag for local JWT development
- Add scripts for mobile port setup and ngrok tunnels
- Add bin/ to .gitignore for build artifacts
Enables USB-connected Android testing and iOS/WiFi testing via ngrok
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Co-Authored-By: Claude <noreply@anthropic.com>