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

lib/db/migrate.ts

@@ -0,0 +1,33 @@
+import { config } from "dotenv";
+import { drizzle } from "drizzle-orm/postgres-js";
+import { migrate } from "drizzle-orm/postgres-js/migrator";
+import postgres from "postgres";
+
+config({
+  path: ".env.local",
+});
+
+const runMigrate = async () => {
+  if (!process.env.DATABASE_URL) {
+    console.log("DATABASE_URL not defined, skipping migrations");
+    process.exit(0);
+  }
+
+  const connection = postgres(process.env.DATABASE_URL, { max: 1 });
+  const db = drizzle(connection);
+
+  console.log("Running migrations...");
+
+  const start = Date.now();
+  await migrate(db, { migrationsFolder: "./lib/db/migrations" });
+  const end = Date.now();
+
+  console.log("Migrations completed in", end - start, "ms");
+  process.exit(0);
+};
+
+runMigrate().catch((err) => {
+  console.error("Migration failed");
+  console.error(err);
+  process.exit(1);
+});