feat: support autoLogin for enabled disableAuth

Call the login method without parameters to log in when disableAuth is enabled.

tests/test_login.py

@@ -0,0 +1,31 @@
+import unittest
+
+from uptime_kuma_api import UptimeKumaApi
+from uptime_kuma_test_case import UptimeKumaTestCase
+
+
+class TestLogin(UptimeKumaTestCase):
+    def test_auto_login(self):
+        # disable auth
+        r = self.api.set_settings(self.password, disableAuth=True)
+        self.assertEqual(r["msg"], "Saved")
+
+        # login again without username and password
+        self.api.logout()
+        self.api.disconnect()
+        self.api = UptimeKumaApi(self.url)
+        self.api.login()
+
+        r = self.api.get_settings()
+        self.assertTrue(r["disableAuth"])
+
+        # enable auth again
+        r = self.api.set_settings(disableAuth=False)
+        self.assertEqual(r["msg"], "Saved")
+
+        r = self.api.get_settings()
+        self.assertFalse(r["disableAuth"])
+
+
+if __name__ == '__main__':
+    unittest.main()