Initial commit: EGBE chatbot template

Stripped from vercel/chatbot (Apache 2.0):
- Dropped @vercel/* packages and AI Gateway
- Removed artifacts feature (code/text/sheet/image side panel)
- Switched AI provider to @ai-sdk/openai-compatible -> EGBE LiteLLM
- Replaced Vercel Blob upload with data URLs
- Dropped Redis resumable streams and rate limiter (in-memory now)
- Added Dockerfile (Next.js standalone) + entrypoint that runs migrations
- Wired DATABASE_URL, EGBE_AI_API_URL/KEY, NEXT_PUBLIC_BASE_URL for app-deploy.sh

Dockerfile

@@ -0,0 +1,46 @@
+FROM node:20-alpine AS base
+
+# --- deps ---
+FROM base AS deps
+RUN apk add --no-cache libc6-compat
+WORKDIR /app
+RUN corepack enable
+COPY package.json pnpm-lock.yaml* ./
+RUN pnpm install --frozen-lockfile
+
+# --- builder ---
+FROM base AS builder
+WORKDIR /app
+RUN corepack enable
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+ENV NEXT_TELEMETRY_DISABLED=1
+RUN pnpm run build
+
+# --- runner ---
+FROM base AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+ENV HOSTNAME=0.0.0.0
+ENV PORT=3000
+
+RUN addgroup --system --gid 1001 nodejs \
+ && adduser --system --uid 1001 nextjs
+
+COPY --from=builder /app/public ./public
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+COPY --from=builder --chown=nextjs:nodejs /app/lib/db/migrations ./lib/db/migrations
+COPY --from=builder --chown=nextjs:nodejs /app/lib/db/migrate.ts ./lib/db/migrate.ts
+COPY --from=builder --chown=nextjs:nodejs /app/node_modules/drizzle-orm ./node_modules/drizzle-orm
+COPY --from=builder --chown=nextjs:nodejs /app/node_modules/postgres ./node_modules/postgres
+COPY --from=builder --chown=nextjs:nodejs /app/node_modules/dotenv ./node_modules/dotenv
+COPY --chown=nextjs:nodejs docker-entrypoint.sh ./docker-entrypoint.sh
+RUN chmod +x ./docker-entrypoint.sh
+
+USER nextjs
+EXPOSE 3000
+ENTRYPOINT ["./docker-entrypoint.sh"]
+CMD ["node", "server.js"]