v4.6.0 - Cleanup release + policy wallet generation fix

Cleanup release. No schema changes and no behaviour changes for customers or
operators, plus one real bug fix that surfaced while verifying the cleanup.

Fixed

• Generating a policy wallet could fatal with Class "Ed25519Compat" not found.
  CardanoWalletPHP.php guarded itself with a class-exists check placed before
  its own require_once of the Ed25519 compat layer. PHP binds the class at compile
  time, so the guard was already true when the file ran and the require never
  executed. It only worked when something earlier in the same request had loaded
  the transaction signer (which loads the compat layer too). The require now comes
  first. Verified on a live site: preprod and mainnet wallets generate with a
  24-word mnemonic, addresses, and extended signing key.

Changed

• All server logging goes through cardanomint_log() (includes/helpers/log.php).
  Debug-level messages only reach the PHP error log when WP_DEBUG is on or the
  cardano_mint_debug_log filter returns true; failure paths log at error level and
  always appear. Four admin handlers that dumped the raw $_POST body to the log no
  longer do.
• Browser console noise is gated the same way. cardano-nft-mint.js routes its
  tracing through cmDebug(), a no-op unless WP_DEBUG is on (localized as
  cardanoMint.debug). console.warn / console.error are untouched.
• The plugin entry file is a third of its old size. The Plugin Setup page, the
  Mint Manager / Active Mints pages, the How to Use page, and the one-time
  migrations moved verbatim into includes/admin/. Plugin paths resolve through
  new CARDANO_MINT_PLUGIN_DIR / _URL / _FILE constants; CARDANO_MINT_VERSION
  is defined as well.
• CardanoCLI is now an honest 78-line facade over the pure-PHP signer and wallet
  generator (its public signatures are unchanged).

Removed

• includes/helpers/WalletGenerator.php: never referenced; its body was a placeholder.
• The Deno-binary and Python fallbacks in CardanoCLI, the activation-time "fix
  binary permissions" step, and two address helpers keyed to the old binary's
  output format. Neither bin/ nor scripts/ ship with the plugin, so none of
  those paths could ever succeed; wallet generation and signing were already pure
  PHP and still are.
• The unreachable client-side address-conversion fallbacks (a Cardano Serialization
  Library path nothing loads, and a placeholder that fabricated an addr1… string).
  If the server-side conversion fails, the raw address is passed through, which is
  what the old chain ended up doing anyway.
• The orphaned cardano_get_connected_wallet AJAX handler (the last CardanoPress
  remnant) and the unauthenticated registration of the Anvil connectivity test
  (cardano_test_anvil_api is admin-only now; only Plugin Setup ever called it).

Install: upload cardano-easy-mint-4.6.0.zip via Plugins → Add New → Upload Plugin.