feat: add Ed25519 (EdDSA) signing support for applet v2.0 - #42
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Add Ed25519 signing support for applet v2.0 (KeyType.ED25519) and an examples/solana_transaction/ demo. Rename the BasicG1 card class to Basic (BasicG1 kept as an alias), pad the SIGN PIN to the spec's 9-byte field with named constants, and guard against silent ECDSA fallback for unknown key types. Bump __version__ to 1.0.5 and update CHANGELOG.rst.
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Add KeyType.ED25519 and EdDSA signing on applet v2.0+, enabling Solana and other Ed25519-based chains.
Verified on applet v2.0.0: signatures verify against the derived key and a native SOL transfer finalized on testnet.