Add Deep Agents UI, pipeline fixes, and agent improvements.

Includes deep-agents-ui integration, rework detection via Gitea,
tool-call sanitization fixes, and startup scripts.

deep-agents-ui/next.config.ts

@@ -0,0 +1,7 @@
+import type { NextConfig } from "next";
+
+const nextConfig: NextConfig = {
+  /* config options here */
+};
+
+export default nextConfig;