feat(wallet): add P2PKH, P2SH-P2WPKH, and P2TR (Taproot/BIP86) address types

- ScriptKind.Taproot (BIP86, purpose 86', P2WPKH → witness v1 bech32m plm1p)
  derivation wired in DerivationPaths and ChainProfiles (xprv/xpub headers,
  no SLIP-132 standard for P2TR); NBitcoin ScriptPubKeyType.TaprootBIP86
- Wizard step StepScriptType inserted between passphrase and password: 4 radio
  buttons (Legacy / Wrapped SegWit / Native SegWit★ / Taproot), localized in
  6 languages; CreateOrRestore now uses SelectedScriptKind instead of hardcoded
  NativeSegwit; back navigation updated accordingly
- BIP86 golden-vector tests (Bip86TaprootTests): output key verified against
  official Bitcoin BIP86 addresses, plm1p prefix asserted

src/Core/Chain/ChainProfile.cs

@@ -29,6 +29,9 @@ public enum ScriptKind
 
     /// <summary>P2WSH (multisig native).</summary>
     NativeSegwitMultisig,
+
+    /// <summary>P2TR key-path only (Taproot, BIP86) — witness v1, bech32m.</summary>
+    Taproot,
 }
 
 /// <summary>

src/Core/Chain/ChainProfiles.cs

@@ -33,6 +33,8 @@ public static class ChainProfiles
             [ScriptKind.WrappedSegwitMultisig] = new(0x0295b005, 0x0295b43f), // Yprv / Ypub
             [ScriptKind.NativeSegwit] = new(0x04b2430c, 0x04b24746),          // zprv / zpub
             [ScriptKind.NativeSegwitMultisig] = new(0x02aa7a99, 0x02aa7ed3),  // Zprv / Zpub
+            // Nessun SLIP-132 per P2TR: il contesto è dato dal path m/86'/…
+            [ScriptKind.Taproot] = new(0x0488ade4, 0x0488b21e),               // xprv / xpub (BIP32 standard)
         },
         // Server di indicizzazione noti per il primo contatto (§3/§9); altri
         // peer vengono scoperti via server.peers.subscribe.
@@ -70,6 +72,7 @@ public static class ChainProfiles
             [ScriptKind.WrappedSegwitMultisig] = new(0x024285b5, 0x024289ef), // Uprv / Upub
             [ScriptKind.NativeSegwit] = new(0x045f18bc, 0x045f1cf6),          // vprv / vpub
             [ScriptKind.NativeSegwitMultisig] = new(0x02575048, 0x02575483),  // Vprv / Vpub
+            [ScriptKind.Taproot] = new(0x04358394, 0x043587cf),               // tprv / tpub (BIP32 standard)
         },
         BootstrapServers = [],
         Checkpoints = [],