feat: complete mealplanner app (backend + frontend + deployment)

.NET 8 backend with Zitadel JWT auth, TheMealDB integration,
weekly meal plan generation, shopping list aggregation.
Vue 3 + Tailwind 4 frontend with dark emerald theme,
manual OIDC PKCE auth, all views implemented.
Multi-stage Dockerfile with nginx reverse proxy.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

nginx.conf

@@ -0,0 +1,30 @@
+server {
+    listen 80;
+    server_name _;
+    root /var/www/html;
+    index index.html;
+
+    # API requests → .NET backend
+    location /api/ {
+        proxy_pass http://localhost:5000;
+        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;
+    }
+
+    # Health check
+    location /health {
+        proxy_pass http://localhost:5000;
+    }
+
+    # Swagger (dev only, but harmless)
+    location /swagger {
+        proxy_pass http://localhost:5000;
+    }
+
+    # SPA fallback
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+}