init: OBDX web landing (Bento Garage design)

- Vite + React + TS + Tailwind v4 + framer-motion + lucide
- 5 sections: Hero, Showcase (steps + 3 cases), Pricing, Comparison, Footer
- Brand assets local (logo v2 SVG, 3 mascots, 6 scenes) under public/brand/
- Dockerfile multi-stage (node 20 build → nginx 1.27 alpine)
- nginx /api/* reverse-proxy to obdx-api:8080, SPA fallback
- /healthz endpoint for Coolify

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

nginx.conf

@@ -0,0 +1,52 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    gzip on;
+    gzip_vary on;
+    gzip_min_length 1024;
+    gzip_types text/plain text/css text/xml application/json application/javascript application/xml+rss application/atom+xml image/svg+xml;
+
+    # Hash-named assets (Vite emits hashed filenames in /assets/) — long cache
+    location ~* ^/assets/.*\.(js|css|woff2?|ttf|otf|eot)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+        try_files $uri =404;
+    }
+
+    # Brand images — versioned via filename, long cache
+    location ~* ^/brand/.*\.(png|jpg|jpeg|svg|webp|gif|ico)$ {
+        expires 30d;
+        add_header Cache-Control "public, max-age=2592000";
+        try_files $uri =404;
+    }
+
+    # Reverse proxy /api/* to FastAPI backend container.
+    # In Coolify the backend service hostname is the application name on the
+    # internal network. Override OBDX_API_UPSTREAM at deploy time if it differs.
+    location /api/ {
+        proxy_pass http://obdx-api:8080;
+        proxy_http_version 1.1;
+        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;
+        proxy_read_timeout 60s;
+        proxy_connect_timeout 5s;
+    }
+
+    # SPA fallback — every non-asset path returns index.html so client routes work
+    location / {
+        try_files $uri $uri/ /index.html;
+        add_header Cache-Control "no-cache";
+    }
+
+    # Healthcheck for Coolify / load balancer
+    location = /healthz {
+        access_log off;
+        return 200 'ok';
+        add_header Content-Type text/plain;
+    }
+}