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/CategoriesController.cs

@@ -0,0 +1,51 @@
+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 CategoriesController : ControllerBase
+{
+    private readonly ICategoryService _categoryService;
+    private Guid UserId => Guid.Parse(User.FindFirstValue(ClaimTypes.NameIdentifier)!);
+
+    public CategoriesController(ICategoryService categoryService) => _categoryService = categoryService;
+
+    [HttpGet]
+    public async Task<ActionResult<List<CategoryResponse>>> GetAll()
+        => Ok(await _categoryService.GetAllAsync(UserId));
+
+    [HttpGet("tree")]
+    public async Task<ActionResult<List<CategoryTreeResponse>>> GetTree()
+        => Ok(await _categoryService.GetTreeAsync(UserId));
+
+    [HttpGet("{id}")]
+    public async Task<ActionResult<CategoryResponse>> GetById(Guid id)
+    {
+        var cat = await _categoryService.GetByIdAsync(UserId, id);
+        return cat == null ? NotFound() : Ok(cat);
+    }
+
+    [HttpPost]
+    public async Task<ActionResult<CategoryResponse>> Create(CreateCategoryRequest request)
+    {
+        var cat = await _categoryService.CreateAsync(UserId, request);
+        return CreatedAtAction(nameof(GetById), new { id = cat.Id }, cat);
+    }
+
+    [HttpPut("{id}")]
+    public async Task<ActionResult<CategoryResponse>> Update(Guid id, UpdateCategoryRequest request)
+        => Ok(await _categoryService.UpdateAsync(UserId, id, request));
+
+    [HttpDelete("{id}")]
+    public async Task<ActionResult> Delete(Guid id)
+    {
+        await _categoryService.DeleteAsync(UserId, id);
+        return NoContent();
+    }
+}