Add SPA routing fix and nginx config for Coolify deployment

nginx.conf

@@ -0,0 +1,13 @@
+server {
+    listen 80;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    gzip on;
+    gzip_types text/plain text/css application/javascript application/json image/svg+xml;
+    gzip_min_length 1000;
+}

public/_redirects

@@ -0,0 +1 @@
+/* /index.html 200