Split Contract Clone Factory for Per-Invoice Deployment

[Kingsman-99]

Description

Deploying a fresh WASM instance per invoice is gas-intensive. A clone factory pattern should deploy minimal-proxy or thin-init clones pointing to a single canonical WASM blob, reducing deployment cost while maintaining per-invoice state isolation.

Technical Context

Add a SplitFactory contract in contracts/factory/src/lib.rs (new crate in the workspace Cargo.toml). Implement deploy_invoice_contract(wasm_hash: BytesN<32>, salt: BytesN<32>, init_args: Vec<Val>) using env.deployer().with_current_contract(salt). Register each deployed address under DeployedContracts(creator) in factory storage.

Acceptance Criteria

• Factory deploys a new split contract with a unique address per (creator, salt) pair
• Duplicate salts for the same creator are rejected
• ContractDeployed(creator, contract_address) event is emitted by the factory
• The factory is added to the workspace Cargo.toml as a new member
• Integration test deploys via factory and invokes init on the deployed contract
• All CI checks (cargo build --target wasm32-unknown-unknown, cargo test, cargo clippy) pass and the branch has no merge conflicts

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[Imole203]

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[Sundriveauto]

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[grantfox-oss]

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@Sundriveauto's PR #549 was approved and merged by @Kingsman-99.

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