feat: add financial interest algorithms#262
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Add financial/interest.dart implementing exact-arithmetic interest math: - calculateBulletInterest / calculateTotalInterestPaid - futureValue / presentValue (time value of money) - generateEqualPrincipalSchedule (straight-line amortisation) - DayCountConvention and FrequencyCode enums + periodFraction helper Uses package:rational for exact fractional arithmetic (no float rounding), added to pubspec.yaml. Includes 18 co-located package:test cases covering period fractions, FV/PV round-trips, and amortisation balances.
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Add financial/interest.dart implementing exact-arithmetic interest math:
Uses package:rational for exact fractional arithmetic (no float rounding), added to pubspec.yaml. Includes 18 co-located package:test cases covering period fractions, FV/PV round-trips, and amortisation balances.
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Fixes: #{$ISSUE_NO}.