Adds a mempool.space-style REST client (RealBitcoinApi, with the same
retry-on-429 pattern as TronGridApi), a polling AssetBalance implementation,
and BitcoinNodeHealthStateTester so the Networks screen can show live
health for Bitcoin nodes (mirrors TronNodeHealthStateTester's rationale:
mempool.space speaks plain REST, not JSON-RPC, so the existing Ethereum/
Substrate testers can't be reused).
Wires Chain.Asset.Type.BitcoinNative through the asset-type mappers and
TypeBasedAssetSourceRegistry, and BitcoinAssetsModule into AssetsModule -
transfers/history stay on the Unsupported stubs until send support lands.
* Add read-only Tron (TRC20) chain family support
Adds Tron as a third chain family alongside Substrate and EVM:
address derivation (BIP44 coin type 195, secp256k1 reused from the
existing Ethereum path, Base58Check encoding), TronGrid-backed TRX
and TRC20 USDT balance display, and a Room migration for the new
per-account Tron key/address columns. Read-only only — no send,
signing, or broadcast support yet.
* fix: exhaustive when branches for Trc20/TronNative asset types
ChainExt.kt's onChainAssetId and Common.kt's existentialDepositError
both switch exhaustively over Chain.Asset.Type and didn't have cases
for the new Trc20/TronNative variants, breaking compilation. Trc20
mirrors EvmErc20 (contract address as the on-chain id, dust burns
rather than transfers on removal); TronNative mirrors EvmNative.
pezkuwichain