Update project structure and dependencies. Introduce new modular architecture for core, application, and infrastructure layers. Add sha2 dependency for enhanced cryptographic functionality. Remove outdated development documentation and refactor file transfer handling to align with the new architecture. Update README to reflect changes in features and project status.

Author: taisirhassan

Cargo.lock

@@ -36,6 +36,7 @@ base64 = "0.21" # For encoding/decoding keys or IDs if needed
 clap = { version = "4.5", features = ["derive"] } # Command-line argument parsing
 ring = "0.16"
 hex = "0.4"
+sha2 = "0.10"
 indicatif = "0.17"
 async-std = "1.12"
 uuid = { version = "1.16.0", features = ["v4"] }