feat: Implement Docker build and serving setup

Adds Dockerfile for frontend and backend, along with Nginx configuration and .dockerignore files. This enables containerized deployment and proper handling of static assets and API proxying. Updates mockDb.ts to correctly type ticket attachments.

Dockerfile.txt

@@ -0,0 +1,15 @@
+
+# Stage 1: Build Frontend
+FROM node:18-alpine as build
+WORKDIR /app
+COPY package*.json ./
+RUN npm install
+COPY . .
+RUN npm run build
+
+# Stage 2: Serve with Nginx
+FROM nginx:alpine
+COPY --from=build /app/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/nginx.conf
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]