Build invoice contract factory

[Kingsman-99]

Label: complexity: high
Points: 200

Description

Deploying a new SplitContract for each project is operationally complex. This issue adds a SplitFactory contract that deploys new SplitContract instances with shared configuration (treasury, fees, whitelist) and maintains a registry of all deployed contract addresses.

Technical Context

Involves a new src/factory.rs. Define SplitFactory with deploy(env, admin, config: FactoryConfig) -> Address that calls env.deployer().upload_contract_wasm() and env.deployer().deploy_contract(). Store deployed addresses in persistent key "deployments" as Vec<Address>. Add get_deployments(env) -> Vec<Address>.

Acceptance Criteria

• deploy() requires factory admin auth
• New SplitContract deployed with provided configuration
• Deployed contract address stored in registry
• get_deployments() returns all deployed contract addresses
• Test deploys 2 contracts via factory and verifies both in registry
• All existing cargo tests pass
• cargo clippy passes with zero warnings

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[samsolo247]

Hi Maintainer,

I’m a smart contract and full-stack developer and would love to contribute to this issue. I’m an experienced contributor with hands-on expertise in Rust, Soroban, Cairo, and TypeScript.

I’m passionate about building secure, scalable blockchain solutions, with a strong emphasis on writing clean and maintainable code. Based on the scope of this issue, I’m confident I can deliver a complete solution within 24 hours of assignment.

I’d greatly appreciate the opportunity to contribute and help move this forward.

[angelyem33-hub]

@angelyem33-hub has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

i will like to work on this issue please

ℹ️ Repo Maintainers: To accept this application, review their application or assign @angelyem33-hub to this issue.

[drips-wave]

Congratulations, @angelyem33-hub! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @angelyem33-hub: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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