chore: add Nginx Dockerfile for Coolify production deployment

Dockerfile

@@ -0,0 +1,14 @@
+# Stage 1: Build Vite SPA
+FROM node:22-alpine AS build
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+COPY . .
+RUN npm run build
+
+# Stage 2: Production Nginx Server
+FROM nginx:alpine
+COPY --from=build /app/dist /usr/share/nginx/html
+COPY --from=build /app/nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]

nginx.conf

@@ -0,0 +1,15 @@
+server {
+    listen 80;
+    server_name _;
+
+    location / {
+        root /usr/share/nginx/html;
+        index index.html index.htm;
+        try_files $uri $uri/ /index.html;
+    }
+
+    error_page 500 502 503 504 /5x.x.html;
+    location = /5x.x.html {
+        root /usr/share/nginx/html;
+    }
+}