Fix: Use correct parameter name sql_query (not query) to match server

FastMCP uses Python function parameter names as MCP tool argument names.
The server function query(sql_query: str) expects 'sql_query' not 'query'.

Author: cboettig

app/chat.js

@@ -1051,7 +1051,7 @@ class BiodiversityChatbot {
             const result = await this.mcpClient.callTool({
                 name: 'query',
                 arguments: {
-                    query: sqlQuery
+                    sql_query: sqlQuery  // Match server's Python function parameter name
                 }
             });