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Add wallet and testnet integration (signing + RPC) #3

Description

@Thaleszh

Is your feature request related to a problem? Please describe.
Currently the SDK lacks high-level integration with wallets or a way to easily connect to the testnet, which makes it hard to sign and broadcast real transactions.

Describe the solution you'd like

  • Add support for reading a mnemonic/private key via .env or secp256k1 interface
  • Implement signing for a MsgSend or identity message
  • Connect to a public KiiChain testnet RPC and broadcast a signed tx
  • Provide a helper like connect_wallet() and broadcast_tx() in the SDK

Describe alternatives you've considered
Relying on external wallet tooling, but native signing improves control and automation.

Additional context
Use tendermint-rpc, cosmrs, or ether-rs as needed depending on signing strategy.

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