Add Taproot BIP-322 message signing

[Jacksper13]

Summary

• add BIP-322 simple message signatures for single-key Taproot addresses
• keep the existing BIP-137 path and output unchanged for other address formats
• return the finalized textual signature consistently to both signed-message file and QR flows
• add simulator coverage using the official BIP-322 transaction vectors and a generated P2TR vector

Why

BIP-137 recoverable ECDSA signatures cannot identify or prove control of a P2TR address. Taproot message signatures therefore failed verification in strict wallets such as Sparrow.

The new path constructs the BIP-322 to_spend and to_sign virtual transactions, computes the BIP-341 key-path sighash, signs it with the existing tweaked Schnorr key helper, and serializes the result as the completed-spec smp simple signature.

Validation

• Python syntax compilation for all changed modules
• full Passport pycodestyle check
• official BIP-322 to_spend and to_sign transaction hash vectors
• P2TR sighash checked against the published generated vector and its valid Schnorr signature
• output encoding checked against Sparrow's current BIP-322 verifier format

The full firmware/simulator build is left to CI because Docker is not available in the local Windows environment.