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/src/lib/utils.ts

@@ -0,0 +1,6 @@
+import { type ClassValue, clsx } from "clsx";
+import { twMerge } from "tailwind-merge";
+
+export function cn(...inputs: ClassValue[]) {
+  return twMerge(clsx(inputs));
+}