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

components/chat/data-stream-handler.tsx

@@ -0,0 +1,29 @@
+"use client";
+
+import { useEffect } from "react";
+import { useSWRConfig } from "swr";
+import { unstable_serialize } from "swr/infinite";
+import { useDataStream } from "./data-stream-provider";
+import { getChatHistoryPaginationKey } from "./sidebar-history";
+
+export function DataStreamHandler() {
+  const { dataStream, setDataStream } = useDataStream();
+  const { mutate } = useSWRConfig();
+
+  useEffect(() => {
+    if (!dataStream?.length) {
+      return;
+    }
+
+    const newDeltas = dataStream.slice();
+    setDataStream([]);
+
+    for (const delta of newDeltas) {
+      if (delta.type === "data-chat-title") {
+        mutate(unstable_serialize(getChatHistoryPaginationKey));
+      }
+    }
+  }, [dataStream, setDataStream, mutate]);
+
+  return null;
+}