chore: Update gemini-extension.json (#6)

Co-authored-by: Wenxin Du <117315983+duwenxin99@users.noreply.github.com>

Author: averikitsch

gemini-extension.json

@@ -3,6 +3,14 @@
   "version": "0.0.0",
   "description": "Connect to Cloud SQL for SQL Server",
   "mcpServers": {
+    "Cloud SQL for SQL Server Admin": {
+      "command": "${extensionPath}${/}toolbox",
+      "args": [
+        "--prebuilt",
+        "cloud-sql-mssql-admin",
+        "--stdio"
+      ]
+    },
     "Cloud SQL for SQL Server": {
       "command": "${extensionPath}${/}toolbox",
       "args": [
@@ -21,4 +29,4 @@
     }
   },
   "contextFileName": "CLOUD-SQL-SQLSERVER.md"
-}
+}