feat: update dependencies and add registry functionality

- Updated `ed25519-dalek` to version 2.2.0 with additional features.
- Added `reqwest` dependency for HTTP requests.
- Implemented health check endpoint in `root_controller`.
- Introduced registry module with functionality to register nodes.
- Enhanced main application to load and generate node keys, and register with the registry.
- Created utility functions for managing node keys, including loading, generating, signing, and verifying messages.
- Updated routing to include health check endpoint.

Author: AdamLBS

.env.example

@@ -1,4 +1,9 @@
 DATABASE_URL=postgres://user:password@localhost/dbname
 JWT_SECRET="super_long_random_secret_64bytes"
 SERVER_HOST="0.0.0.0"
-SERVER_PORT="8080"
+SERVER_PORT="8080"
+REGISTRY_URL="http://localhost:8081"
+NODE_NAME="node-eu1"
+NODE_HOST="host.docker.internal"
+NODE_API_URL="http://host.docker.internal:8080"
+CONTACT_EMAIL="ops@hushnet.net"

.gitignore

@@ -1,2 +1,3 @@
 target/
 .env
+~/.hushnet/node_keys