Implement-oracle-backed-collateral-valuation

[MaryammAli]

Summary

This PR implements oracle-backed collateral valuation to calculate borrowing power using asset prices instead of relying solely on raw deposited amounts.

Changes

• Added support for price inputs through an oracle/read-model strategy.
• Updated collateral valuation logic to use configurable oracle-backed asset values.
• Integrated collateral checks based on current asset prices rather than deposited quantities.
• Enforced borrowing constraints using oracle-derived collateral values.

Tests

Added test coverage for:

• ✅ Correct collateral valuation using oracle prices.
• ✅ Borrow limit enforcement under varying asset prices.
• ✅ Validation of borrow constraints for undercollateralized positions.

Acceptance Criteria

• Price inputs are available to the contract or read-model strategy.
• Collateral checks use configurable oracle-backed values.
• Borrow constraints are validated in tests.

Closes #31

[MaryammAli]

@Cedarich
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