Wire deploy optimization, add configurable friendbot/faucet support, and use dynamic Horizon URLs

[Johnsmichael150]

Summary

This PR enhances StarForge network portability and deploy tooling by adding configurable friendbot/faucet support, removing hardcoded Horizon faucet URLs, and wiring Soroban WASM optimization into the deploy pipeline.

Changes

• Added optional friendbot_url to NetworkConfig
• Enabled network add --friendbot-url
• Updated wallet funding to use network-specific faucet URLs from config
• Refactored src/utils/horizon.rs to resolve Horizon endpoints dynamically
• Wired deploy --optimize support in src/commands/deploy.rs
• Added deploy size warnings and external optimization guidance for WASM artifacts near or exceeding 128 KB
• Updated associated CLI behavior and docs

Files changed

• src/utils/config.rs
• src/utils/horizon.rs
• src/commands/deploy.rs
• src/commands/network.rs
• src/commands/wallet.rs
• Cargo.lock

Testing

• cargo run -- network add customnet --friendbot-url https://faucet.example.com
• cargo run -- wallet fund --network customnet
• cargo run -- deploy --optimize <args>
• Confirm deploy warnings when artifact size approaches or exceeds 128 KB

Close #111
Close #103
Close #125
Close #110

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