docs: add SQL Lab Export to Parquet to community extensions registry (#36755)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

docs/developer_portal/extensions/registry.md

@@ -33,6 +33,7 @@ This page serves as a registry of community-created Superset extensions. These e
 | [Extensions API Explorer](https://github.com/michael-s-molina/superset-extensions/tree/main/api_explorer) | A SQL Lab panel that demonstrates the Extensions API by providing an interactive explorer for testing commands like getTabs, getCurrentTab, and getDatabases. Useful for extension developers to understand and experiment with the available APIs. | Michael S. Molina  | <a href="/img/extensions/api-explorer.png" target="_blank"><img src="/img/extensions/api-explorer.png" alt="Extensions API Explorer" width="120" /></a>           |
 | [SQL Query Flow Visualizer](https://github.com/msyavuz/superset-sql-visualizer)                           | A SQL Lab panel that transforms SQL queries into interactive flow diagrams, helping developers and analysts understand query execution paths and data relationships.                                                                                | Mehmet Salih Yavuz | <a href="/img/extensions/sql-flow-visualizer.png" target="_blank"><img src="/img/extensions/sql-flow-visualizer.png" alt="SQL Flow Visualizer" width="120" /></a> |
 | [SQL Lab Export to Google Sheets](https://github.com/michael-s-molina/superset-extensions/tree/main/sqllab_gsheets) | A Superset extension that allows users to export SQL Lab query results directly to Google Sheets. | Michael S. Molina | <a href="/img/extensions/gsheets-export.png" target="_blank"><img src="/img/extensions/gsheets-export.png" alt="SQL Lab Export to Google Sheets" width="120" /></a> |
+| [SQL Lab Export to Parquet](https://github.com/rusackas/superset-extensions/tree/main/sqllab_parquet) | Export SQL Lab query results directly to Apache Parquet format with Snappy compression. | Evan Rusackas | <a href="/img/extensions/parquet-export.png" target="_blank"><img src="/img/extensions/parquet-export.png" alt="SQL Lab Export to Parquet" width="120" /></a> |
 
 ## How to Add Your Extension