Add Stellar Network Configuration (Testnet vs Mainnet)

[greatest0fallt1me]

Description
Support multiple networks: testnet and mainnet. Read from env (STELLAR_NETWORK or SOROBAN_NETWORK). Use correct Horizon URL, Soroban RPC URL, and contract IDs per network. Document env vars and contract addresses per network.

Requirements and context

• Must not mix testnet and mainnet
• Vault contract ID and settlement contract ID per network

Suggested execution

• Fork the repo and create a branch
• git checkout -b feature/network-config
• Implement changes
  • Add network to config; map to Horizon/RPC URLs and contract IDs; use in Soroban client and deposit tx builder
  • Example commit message: feat: Stellar network configuration (testnet/mainnet)

Guidelines

• Clear documentation
• Timeframe: 96 hours
• Project details: #

[drips-wave]

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[Obiajulu-gif]

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[Elite-tch]

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[1nonlypiece]

@1nonlypiece has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hi Maintainers 👋,

I’d like to apply for this issue.

I have hands-on experience with Next.js frontend development as well as Stellar smart contracts using Rust (Soroban). I’m comfortable working with Figma designs, integrating APIs/wallets on the frontend, and implementing, testing, and optimizing smart contracts on Stellar.

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[Adeswalla]

@Adeswalla has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hello Maintainter,
I would like to apply to this issue and work on it because as a Javascript and Typescript i prioritize functional and production-level code.

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