[Factory] Define FactoryError variants in errors.rs

[ryzen-xp]

📝 Description

Define all error variants for the factory contract in factory_contract/src/errors.rs.

✅ Requirements

#[contracterror]
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub enum FactoryError {
    
}

🎯 Acceptance Criteria

• All 4 variants defined with correct attributes
• Imported in lib.rs
• cargo build passes

📁 Expected files to change/structure

• gateway-contract/contracts/factory_contract/src/errors.rs

---

🌿 Branch: feat/factory-errors | Priority: MED | Difficulty: ☕ easy

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[Arome8240]

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