fix(api): set compatibility options without crashing

clip_skip and the uni_pc_* opts live in opts.data without an OptionInfo in
data_labels (compatibility_opts). Options.set() read data_labels[key].onchange
unconditionally, so setting clip_skip via /sdapi/v1/options raised KeyError and
returned 500; the override_settings restore path had the same unguarded
data_labels[k] access for falsy-valued compat opts.

Guard the onchange lookup and read the stored value via getattr(opts, k), which
already falls back through data then data_labels.

modules/options_handler.py

@@ -109,7 +109,8 @@ class Options:
             setattr(self, key, value)
         except RuntimeError:
             return False
-        func = self.data_labels[key].onchange
+        # compatibility_opts (e.g. clip_skip) live in data without a data_labels entry
+        func = self.data_labels[key].onchange if key in self.data_labels else None
         if func is not None:
             try:
                 func()