feat: Add Supabase configuration and migrations for MC Cars application

- Create Kong declarative configuration for routing and authentication.
- Implement initialization script to set up the database.
- Add SQL migration for initializing roles, schemas, and seeding vehicle data.
- Create leads and customers tables with appropriate policies and functions for CRM.
- Seed admin user and configure storage bucket with RLS policies.

frontend/nginx.conf

@@ -0,0 +1,22 @@
+server {
+    listen 80;
+    server_name _;
+
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # Never cache config.js / html so runtime config updates take effect.
+    location = /config.js { add_header Cache-Control "no-store"; try_files $uri =404; }
+    location ~* \.html$    { add_header Cache-Control "no-store"; try_files $uri =404; }
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Static assets can be cached aggressively.
+    location ~* \.(?:css|js|jpg|jpeg|png|webp|svg|ico|woff2?)$ {
+        expires 7d;
+        add_header Cache-Control "public";
+        try_files $uri =404;
+    }
+}