Add native SOL send and account info for Solana, using the card's
Ed25519 key. Transaction building and serialization are delegated to
solders; the card signs the raw message bytes and the 64-byte signature
is grafted onto the message to produce the broadcastable transaction.

- wallet/solana.py: Ed25519 address derivation (base58 of the raw key),
  JSON-RPC client (balance/blockhash/broadcast), transfer-message
  building and transaction assembly, and SolanaValidator
- command/solana.py: "solana send" and "solana config" commands
- command/options/solana.py: argument parsing, address and network
  validation
- card/info.py: show SOL address and balance in the info table
- config/enums: default "solana" config section and SolanaNetwork enum
- register the solana command in the factory

Bump cryptnox-sdk-py to >=1.0.5 (Ed25519 key derivation/signing) and
add solders>=0.27.0. Ignore *.egg-info/.

…verification, network/amount/balance safety, config fixes)

  Add the Solana command and wallet backend (send/transaction flow,
  address validation), enum/config/factory wiring, and CLI options;
  repoint BTC mainnet to blockstream.info and add base58/solders deps.
  Align signing with SDK v2.0 SIGN, with amount bounds,
  confirm-before-sign, and network/endpoint handling. Drop the dead
  old_key local in config.py so flake8 passes without a workflow
  ignore.