- Add FtsIndexParam/FtsQueryParam class stubs to model/param/__init__.pyi
- Add Fts/FtsIndexParam/FtsQueryParam to zvec/__init__.pyi exports
- Extend Query.param type to include FtsQueryParam
- Update Query._validate to allow fts + FtsQueryParam combination
- Extend FieldSchema.index_param type to support FtsIndexParam
- Extend Collection.create_index type to support FtsIndexParam