Add Docker deployment, remove Clerk auth, and configure OSS mode

frontend/dockerfile

@@ -0,0 +1,39 @@
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+ARG NEXT_PUBLIC_API_URL
+ENV NEXT_PUBLIC_API_URL=$NEXT_PUBLIC_API_URL
+
+COPY package*.json ./
+RUN npm ci
+
+COPY . .
+
+ENV NEXT_TELEMETRY_DISABLED=1
+
+RUN echo "BUILD API URL=$NEXT_PUBLIC_API_URL"
+RUN npm run build
+
+FROM node:20-alpine
+
+WORKDIR /app
+
+ARG NEXT_PUBLIC_API_URL
+ENV NEXT_PUBLIC_API_URL=$NEXT_PUBLIC_API_URL
+
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+
+COPY --from=builder /app/package*.json ./
+RUN npm ci --omit=dev
+
+COPY --from=builder /app/.next ./.next
+COPY --from=builder /app/public ./public
+COPY --from=builder /app/src ./src
+COPY --from=builder /app/package.json ./package.json
+COPY --from=builder /app/next.config.ts ./next.config.ts
+
+EXPOSE 3000
+
+CMD ["npm","run","start"]