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/Dockerfile

@@ -0,0 +1,16 @@
+FROM nginx:1.27-alpine
+
+# Copy static assets
+COPY . /usr/share/nginx/html
+
+# Copy nginx config
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+# Generate runtime config.js so the frontend picks up env vars at container start
+# (anon key only — safe for the browser).
+RUN rm -f /usr/share/nginx/html/Dockerfile /usr/share/nginx/html/nginx.conf
+
+RUN printf '#!/bin/sh\nset -eu\ncat > /usr/share/nginx/html/config.js <<EOF\nwindow.MCCARS_CONFIG = {\n  SUPABASE_URL: "${SUPABASE_URL:-http://localhost:8000}",\n  SUPABASE_ANON_KEY: "${SUPABASE_ANON_KEY:-}"\n};\nEOF\nexec nginx -g "daemon off;"\n' > /docker-entrypoint.d/99-config.sh \
+    && chmod +x /docker-entrypoint.d/99-config.sh
+
+EXPOSE 80