Fix/152 module trait di

[ritik4ever]

Fix tight coupling between modules via trait-based DI

Introduces src/interfaces.rs with 7 port traits (ArbitrationPort, InsurancePort, EscrowObserver, AnalyticsPort, EscrowMetricsPort, AuditPort, ProvenancePort). Each concrete type implements its trait(s). All calling modules (escrow, tokenization, performance, reporting, backup) are refactored to accept generic type parameters instead of direct imports. lib.rs wires production types via turbofish at the single call-site layer. tests/test_module_isolation.rs validates each mock port in isolation.

Closes #152

[github-actions]

⚠️ PR Title Format

Please update your PR title to follow the conventional commit format:

type(scope): description

Types: feat, fix, docs, style, refactor, test, chore, perf, ci, build, revert

Examples:

• feat(contract): add learning reward distribution
• fix(escrow): resolve timeout calculation bug
• docs: update contributing guidelines

See CONTRIBUTING.md for details.

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[ritik4ever]

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[ritik4ever]

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