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

.env.example

@@ -0,0 +1,12 @@
+# NextAuth secret — generate with: openssl rand -base64 32
+AUTH_SECRET=replace-me
+
+# Postgres connection string (provisioned automatically by app-deploy.sh)
+DATABASE_URL=postgres://user:pass@host:5432/db
+
+# EGBE LiteLLM proxy — auto-injected by app-deploy.sh from the deploying instance
+EGBE_AI_API_URL=https://proxy.gcp.egbe.dev/v1
+EGBE_AI_API_KEY=
+
+# Public origin of this app — auto-injected by app-deploy.sh
+NEXT_PUBLIC_BASE_URL=http://localhost:3000