feat(handler): add apple encrypted archive handler - #1617
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Adds a handler for Apple Encrypted Archive files (magic AEA1). Parses the auth-data TLV fields to locate the WKMS FCS key URL, fetches the session key via HPKE (P-256 / HKDF-SHA256 / AES-256-GCM), and decrypts the payload using the python-aea library. Files without embedded WKMS fields are skipped with a warning. pyhpke, python-aea and its pyliblzfse dependency are not in nixpkgs, so they are built from PyPI in overlay.nix. python-aea uses enum.StrEnum without declaring a Python version bound, which breaks the whole CLI on the 3.10 we still support. It is therefore declared as a 3.11+ dependency and imported lazily, so on 3.10 archives are still identified, only not decrypted.
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Adds a handler for Apple Encrypted Archive files (magic AEA1). Parses the auth-data TLV fields to locate the WKMS FCS key URL, fetches the session key via HPKE (P-256 / HKDF-SHA256 / AES-256-GCM), and decrypts the payload using the python-aea library. Files without embedded WKMS fields are skipped with a warning.
New dependencies: python-aea, pyhpke, asn1crypto, requests.