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.Api/Controllers/LoansController.cs

@@ -0,0 +1,37 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Purrse.Core.DTOs;
+using Purrse.Core.Interfaces.Services;
+using System.Security.Claims;
+
+namespace Purrse.Api.Controllers;
+
+[Authorize]
+[ApiController]
+[Route("api/[controller]")]
+public class LoansController : ControllerBase
+{
+    private readonly ILoanService _loanService;
+    private Guid UserId => Guid.Parse(User.FindFirstValue(ClaimTypes.NameIdentifier)!);
+
+    public LoansController(ILoanService loanService) => _loanService = loanService;
+
+    [HttpGet("{accountId}/amortization")]
+    public async Task<ActionResult<LoanDetailResponse>> GetLoanDetail(Guid accountId)
+    {
+        var detail = await _loanService.GetLoanDetailAsync(UserId, accountId);
+        return detail == null ? NotFound() : Ok(detail);
+    }
+
+    [HttpPost("{accountId}")]
+    public async Task<ActionResult<LoanDetailResponse>> CreateLoanDetail(Guid accountId, CreateLoanDetailRequest request)
+        => Ok(await _loanService.CreateLoanDetailAsync(UserId, accountId, request));
+
+    [HttpPut("{accountId}")]
+    public async Task<ActionResult<LoanDetailResponse>> UpdateLoanDetail(Guid accountId, CreateLoanDetailRequest request)
+        => Ok(await _loanService.UpdateLoanDetailAsync(UserId, accountId, request));
+
+    [HttpPost("{accountId}/payoff-scenario")]
+    public async Task<ActionResult<PayoffScenarioResponse>> PayoffScenario(Guid accountId, PayoffScenarioRequest request)
+        => Ok(await _loanService.CalculatePayoffScenarioAsync(UserId, accountId, request));
+}