Add Docker support with Dockerfile and .dockerignore, update package dependencies, and switch to adapter-node for Svelte

Dockerfile

@@ -0,0 +1,26 @@
+FROM node:22-alpine
+
+WORKDIR /app
+
+COPY package.json .
+COPY package-lock.json .
+
+RUN npm install
+
+ARG DATABASE_URL
+ENV DATABASE_URL=$DATABASE_URL
+COPY prisma.config.ts .
+COPY prisma ./prisma
+
+RUN npx prisma migrate deploy
+RUN npx prisma generate
+
+COPY . .
+
+RUN npm run build
+
+EXPOSE 3000
+
+ARG ORIGIN
+ENV ORIGIN=$ORIGIN
+CMD ["node", "build"]