DocNR 8e68fcf60f Fix Android Amber signer integration and cleanup repo structure
- Added Amber external signer integration for secure private key management on Android

- Fixed authentication issues and NIP-55 protocol implementation

- Added comprehensive documentation in amber-integration-fixes.md

- Moved android_backup to external location to keep repo clean

- Updated .gitignore to exclude APK files
2025-04-01 00:03:41 -04:00
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