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/submit-button.tsx

@@ -0,0 +1,38 @@
+"use client";
+
+import { useFormStatus } from "react-dom";
+
+import { LoaderIcon } from "@/components/chat/icons";
+
+import { Button } from "../ui/button";
+
+export function SubmitButton({
+  children,
+  isSuccessful,
+}: {
+  children: React.ReactNode;
+  isSuccessful: boolean;
+}) {
+  const { pending } = useFormStatus();
+
+  return (
+    <Button
+      aria-disabled={pending || isSuccessful}
+      className="relative"
+      disabled={pending || isSuccessful}
+      type={pending ? "button" : "submit"}
+    >
+      {children}
+
+      {(pending || isSuccessful) && (
+        <span className="absolute right-4 animate-spin">
+          <LoaderIcon />
+        </span>
+      )}
+
+      <output aria-live="polite" className="sr-only">
+        {pending || isSuccessful ? "Loading" : "Submit form"}
+      </output>
+    </Button>
+  );
+}