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>

frontend/nginx.conf

@@ -0,0 +1,26 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    location /api/ {
+        proxy_pass http://api:8080;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    location /hubs/ {
+        proxy_pass http://api:8080;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+        proxy_set_header Host $host;
+    }
+}