Add ability to run small scripts from the ui and added a merge lora script

ui_scripts/test_script.py

@@ -0,0 +1,46 @@
+"""Example UI script invoked via POST /api/scripts.
+
+The API streams stdout/stderr back to the caller. To return structured data,
+print a single JSON object on the final line of stdout — the route parses it
+into the `result` field of the response.
+"""
+
+import argparse
+import json
+import sys
+import time
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description="Example ui_scripts entry point.")
+    parser.add_argument("--message", default="hello", help="Message to echo back.")
+    parser.add_argument(
+        "--count", type=int, default=3, help="Number of log lines to emit."
+    )
+    parser.add_argument(
+        "--delay", type=float, default=0.0, help="Seconds to sleep between log lines."
+    )
+    parser.add_argument(
+        "--fail", action="store_true", help="Exit non-zero to demo failure handling."
+    )
+    args = parser.parse_args()
+
+    for i in range(args.count):
+        print(f"[{i + 1}/{args.count}] {args.message}", flush=True)
+        if args.delay > 0:
+            time.sleep(args.delay)
+
+    if args.fail:
+        print("intentional failure", file=sys.stderr, flush=True)
+        return 1
+
+    # Final line: JSON payload the API surfaces as `result`.
+    print(
+        json.dumps({"message": args.message, "count": args.count, "ok": True}),
+        flush=True,
+    )
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())