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Major code reorganization to eliminate duplication and improve maintainability:
- Created pkg/crypto: shared cryptographic functions (padding, AES-GCM, ECDH, HMAC auth)
- Created pkg/protocol: unified message structures and JSON serialization
- Created pkg/identity: persistent identity management (load/save/generate)
- Created pkg/tor: Tor SOCKS5 proxy connection utilities
- Refactored server to use shared packages (cmd/server)
- Refactored CLI client with shared packages (cmd/cli-client)
- Refactored GUI client with shared packages (cmd/gui-client)
- Refactored web client with embedded HTML template (cmd/web-client)
Security improvements:
- Replaced math/rand with crypto/rand for randomDelay()
- Added proper error handling for crypto operations
Code reduction: eliminated ~500+ lines of duplicated code
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