Fix: Refactor contracts into smaller, focused modules with clear responsibilites.

[Lansa-18]

Closes #101 — Modularization Summary

All 12 contracts have been refactored from monolithic lib.rs files into focused modules following the established property-token pattern.

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Pattern Applied

Each contract was split into:

• errors.rs — Error enum + Display + ContractError trait implementation
• types.rs — Data structs and enums (with SCALE + StorageLayout derives)
• tests.rs — #[cfg(test)] mod tests { ... } with #[ink::test] functions
• lib.rs — Retains storage, constructor, messages, events; uses include!() to pull in sub-files

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Contracts Modularized

Contract	errors.rs	types.rs	tests.rs	Notes
insurance	✅ Created	✅ Already existed	✅ Created	Tests at crate root
metadata	✅ Created	✅ Created	✅ Created	—
proxy	✅ Created	✅ Created	✅ Created	—
database	✅ Created	✅ Created	✅ Created	—
third-party	✅ Created	✅ Created	✅ Created	—
dex	✅ Created	N/A	✅ Created	All types in propchain_traits
oracle	N/A	✅ Created	✅ Created	Error re-exported from propchain_traits
escrow	✅ Created	✅ Created	✅ Already existed	Used pub mod tests pattern
fees	✅ Created	✅ Created	✅ Created	—
bridge	✅ Created	N/A	✅ Created	All types in propchain_traits
governance	✅ Created	✅ Created	✅ Created	—
staking	✅ Created	✅ Created	✅ Created	LockPeriod impl block extracted with type

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Verification

cargo check --workspace

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@Lansa-18 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

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[Lansa-18]

@LaGodxy Kindly go through chief