feat(wm): add threshold-based layout_options_rules for workspaces

Adds layout_options_rules to workspace configuration, allowing
layout_options to dynamically change based on container count. Uses the
same threshold semantics as layout_rules: when container count >=
threshold, the highest matching rule fully replaces the base
layout_options.

schema.json

@@ -4214,6 +4214,19 @@
             }
           ]
         },
+        "layout_options_rules": {
+          "description": "Threshold-based layout options rules in the format of threshold => options.\nWhen container count >= threshold, the highest matching threshold's options\nfully replace the base `layout_options`.\nThis follows the same threshold logic as `layout_rules`.",
+          "type": [
+            "object",
+            "null"
+          ],
+          "additionalProperties": false,
+          "patternProperties": {
+            "^\\d+$": {
+              "$ref": "#/$defs/LayoutOptions"
+            }
+          }
+        },
         "layout_rules": {
           "description": "Layout rules in the format of threshold => layout",
           "type": [