Add Linux App Store Web Portal with Kubernetes deployment

- React-style static web portal with Tailwind CSS
- OS detection (Debian/Ubuntu, Fedora, Arch, Generic)
- Dynamic install commands (apt://, appstream://, flatpak)
- 9 pre-configured applications
- Kubernetes: 2 replicas, LoadBalancer service, Nginx ingress
- GitLab Container Registry (git.giaco.net/capitano/webapplinux)
- Namespace: linuxwebapp
- Added Dockerfile, nginx.conf, deploy.sh, docker-compose.yml
- Updated README.md with deployment instructions

nginx.conf

@@ -0,0 +1,26 @@
+server {
+    listen 80;
+    server_name apps.local;
+    
+    root /usr/share/nginx/html;
+    index index.html;
+    
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+    
+    location /apps.json {
+        add_header Content-Type application/json;
+        add_header Access-Control-Allow-Origin *;
+    }
+    
+    gzip on;
+    gzip_vary on;
+    gzip_min_length 1024;
+    gzip_types text/plain text/css text/xml text/javascript application/javascript application/xml application/json;
+    
+    error_page 500 502 503 504 /50x.html;
+    location = /50x.html {
+        root /usr/share/nginx/html;
+    }
+}