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

app/(chat)/api/vote/route.ts

@@ -0,0 +1,84 @@
+import { z } from "zod";
+import { auth } from "@/app/(auth)/auth";
+import { getChatById, getVotesByChatId, voteMessage } from "@/lib/db/queries";
+import { ChatbotError } from "@/lib/errors";
+
+const voteSchema = z.object({
+  chatId: z.string(),
+  messageId: z.string(),
+  type: z.enum(["up", "down"]),
+});
+
+export async function GET(request: Request) {
+  const { searchParams } = new URL(request.url);
+  const chatId = searchParams.get("chatId");
+
+  if (!chatId) {
+    return new ChatbotError(
+      "bad_request:api",
+      "Parameter chatId is required."
+    ).toResponse();
+  }
+
+  const session = await auth();
+
+  if (!session?.user) {
+    return new ChatbotError("unauthorized:vote").toResponse();
+  }
+
+  const chat = await getChatById({ id: chatId });
+
+  if (!chat) {
+    return new ChatbotError("not_found:chat").toResponse();
+  }
+
+  if (chat.userId !== session.user.id) {
+    return new ChatbotError("forbidden:vote").toResponse();
+  }
+
+  const votes = await getVotesByChatId({ id: chatId });
+
+  return Response.json(votes, { status: 200 });
+}
+
+export async function PATCH(request: Request) {
+  let chatId: string;
+  let messageId: string;
+  let type: "up" | "down";
+
+  try {
+    const parsed = voteSchema.parse(await request.json());
+    chatId = parsed.chatId;
+    messageId = parsed.messageId;
+    type = parsed.type;
+  } catch {
+    return new ChatbotError(
+      "bad_request:api",
+      "Parameters chatId, messageId, and type are required."
+    ).toResponse();
+  }
+
+  const session = await auth();
+
+  if (!session?.user) {
+    return new ChatbotError("unauthorized:vote").toResponse();
+  }
+
+  const chat = await getChatById({ id: chatId });
+
+  if (!chat) {
+    return new ChatbotError("not_found:vote").toResponse();
+  }
+
+  if (chat.userId !== session.user.id) {
+    return new ChatbotError("forbidden:vote").toResponse();
+  }
+
+  await voteMessage({
+    chatId,
+    messageId,
+    type,
+  });
+
+  return new Response("Message voted", { status: 200 });
+}