add settings in UI

tests/test_config.py

@@ -0,0 +1,20 @@
+import tempfile
+import unittest
+from pathlib import Path
+
+from fgai.config import ConfigStore
+
+
+class ConfigTests(unittest.TestCase):
+    def test_public_config_hides_token_and_preserves_blank_update(self):
+        with tempfile.TemporaryDirectory() as directory:
+            store = ConfigStore(str(Path(directory) / "config.json"))
+            store.update({"log_source": "graylog_mcp", "graylog_mcp_token": "secret"})
+            public = store.update({"graylog_mcp_token": ""})
+            self.assertEqual(public["log_source"], "graylog_mcp")
+            self.assertTrue(public["graylog_mcp_token_configured"])
+            self.assertNotIn("graylog_mcp_token", public)
+
+
+if __name__ == "__main__":
+    unittest.main()