Initial commit: Purrse personal finance app

Self-hosted, plugin-extensible personal finance manager built with
ASP.NET Core 9.0, Vue 3 + Vuetify 3, and PostgreSQL 17.

Backend (8 .NET projects):
- Core: 19 domain models, 6 enums, 14 DTOs, 12 service interfaces
- Data: EF Core DbContext, 16 entity configurations, category seeder
- API: 14 controllers, 15 services, JWT auth, SignalR, middleware
- Plugins: Abstractions + OFX/CSV/QIF file parsers
- Tests: 28 xUnit tests (fingerprinting, duplicate detection, parsers)

Frontend (Vue 3 + Vuetify 3 + TypeScript):
- 13 views, Pinia stores, Axios API services with JWT interceptors
- Dashboard, accounts, transactions, categories, imports, and more

Deployment:
- Docker Compose (PostgreSQL 17 + .NET API + nginx frontend)
- Auto-migration on startup

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/Purrse.Core/DTOs/LoanDtos.cs

@@ -0,0 +1,50 @@
+namespace Purrse.Core.DTOs;
+
+public record CreateLoanDetailRequest(
+    decimal OriginalBalance,
+    decimal InterestRate,
+    int TermMonths,
+    decimal MonthlyPayment,
+    DateTime OriginationDate,
+    DateTime MaturityDate,
+    decimal? EscrowAmount,
+    decimal? ExtraPayment
+);
+
+public record LoanDetailResponse(
+    Guid Id,
+    Guid AccountId,
+    string AccountName,
+    decimal OriginalBalance,
+    decimal CurrentBalance,
+    decimal InterestRate,
+    int TermMonths,
+    decimal MonthlyPayment,
+    DateTime OriginationDate,
+    DateTime MaturityDate,
+    decimal? EscrowAmount,
+    decimal? ExtraPayment,
+    List<AmortizationEntryResponse> AmortizationSchedule
+);
+
+public record AmortizationEntryResponse(
+    int PaymentNumber,
+    DateTime PaymentDate,
+    decimal PaymentAmount,
+    decimal PrincipalAmount,
+    decimal InterestAmount,
+    decimal? EscrowAmount,
+    decimal RemainingBalance
+);
+
+public record PayoffScenarioRequest(decimal? ExtraMonthlyPayment, decimal? LumpSumPayment, DateTime? LumpSumDate);
+
+public record PayoffScenarioResponse(
+    DateTime OriginalPayoffDate,
+    DateTime NewPayoffDate,
+    decimal TotalInterestOriginal,
+    decimal TotalInterestNew,
+    decimal InterestSaved,
+    int MonthsSaved,
+    List<AmortizationEntryResponse> NewSchedule
+);