Request: Add native Stellar (XLM) network support

[AlexanderPhilippov]

Summary

Add native support for the Stellar network (XLM) to OneKey so users can hold, send, receive, and view Stellar assets (native XLM and Stellar tokens/Assets).

Use cases

• Store and transfer XLM (Lumens) natively.
• Manage Stellar-issued assets (custom assets) and trustlines.
• View transaction history and balances from Horizon.
• Sign Stellar transactions from mnemonic/private key managed by OneKey.

Proposed scope

• Integrate Stellar SDK (e.g., stellar-sdk) for keypair generation, transaction building and signing, and Horizon API interactions.
• UI: add Stellar to network list, wallet balance view, send/receive flows, asset/trustline management, and transaction history.
• Support import of existing Stellar accounts via seed/private key and export/backup flows compatible with OneKey's seed phrase system.
• Basic security: local signing, no secret exfiltration, same UX for passphrase/biometrics as other networks.

Technical notes

• Stellar uses ed25519 keypairs and Horizon API (not EVM RPC). Recommended libraries: stellar-sdk (JS), js-stellar-sdk.
• Transaction flow requires creating and funding trustlines for non-native assets; UI should prompt users to add trustline when receiving tokens.
• Fee structure: network fees are in XLM (base fee); consider fee estimation using Horizon.
• Optional: support SEP-0007/SEP-0005 if useful for dApp integrations.

Backwards compatibility & security

• No changes to existing seed format required if using BIP39/BIP44 compatible derivation — document derivation path used (e.g., m/44'/148'/0').
• Ensure consistent key derivation and display of Stellar addresses (G... account IDs).
• Tests: unit tests for derivation, signing, and integration tests with Horizon testnet.

Acceptance criteria

• Users can create/import Stellar accounts and view XLM balance.
• Users can send/receive XLM and add trustlines for Stellar assets.
• Transaction history visible and correct for recent operations.
• All private keys remain stored/signed locally with same security guarantees as other networks.

Additional context / resources

• Stellar SDK: https://github.com/stellar/js-stellar-sdk
• Horizon API docs: https://developers.stellar.org/api/
• Stellar key derivation BIP44 coin type: 148 (m/44'/148'/n')
• Example wallets: Lobstr, StellarTerm, Freighter (for UX references)