KarpelesLab / libwallet / 24377250747

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add BTC transaction sending + fix CI macOS headerpad

## Phase 4.4: BTC transaction building and sending
- New wlttx/bitcoin.go: builds Bitcoin-family transactions using
  outscript's BtcTx (not modchain_maketx — avoids signature-length quirks)
- UTXO fetch: modchain_lookupTxoBIP32(xpub, "m/0", unspent=true)
- Coin selection: greedy largest-first with fee-aware loop
- Fee estimation: estimatesmartfee RPC, fallback 10 sat/vB
- Change address: next clean m/1/i derived locally
- Per-input TSS signing via btcInputSigner (crypto.Signer) which
  combines the account IL with the input's derivation path IL
  (m/{chain}/{index}) so the TSS produces a valid child-key signature
- BCH uses sighash 0x41 (SIGHASH_ALL | SIGHASH_FORKID); others use 1
- Broadcast via sendrawtransaction

## wlttx/transaction.go
- bitcoin_transfer validated and routed to buildBitcoinTx
- SignAndSend: new bitcoin branch that calls buildBitcoinTx + broadcast

## CI fix
- test-host job now builds the local c-shared dylib with
  -headerpad_max_install_names so dart test's install_name_tool
  rewriting works (was failing on macos-latest runners).

Still TODO: real testnet validation of TSS signatures for BTC.
Compilation is clean and all existing tests pass.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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