test: add flash loan repayment coverage#464
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closes #405
##Summary
Adds focused Rust unit coverage for flash loan success and failure paths.
Covers single-asset repayment, custom fee behavior, principal-only underpayment, batch repayment, partial batch repayment, and duplicate-token fee accounting.
Hardens flash loan fee and repayment calculations with shared checked helpers.
Fixes duplicate-token batch repayment verification by aggregating required repayment per token.
Keeps Kani verification gating clean for normal Rust test/build runs.
##Reason
This prepares the flash loan contract for testnet readiness by verifying repayment invariants and fee enforcement across single and batch loan flows.