chore: Update gemini-extension.json (#5)

Author: averikitsch

gemini-extension.json

@@ -3,6 +3,14 @@
   "version": "0.1.0",
   "description": "Create, connect, and interact with a Cloud SQL for PostgreSQL database and data.",
   "mcpServers": {
+    "Cloud SQL for PostgreSQL Admin": {
+      "command": "${extensionPath}${/}toolbox",
+      "args": [
+        "--prebuilt",
+        "cloud-sql-postgres-admin",
+        "--stdio"
+      ]
+    },
     "Cloud SQL for PostgreSQL": {
       "command": "${extensionPath}${/}toolbox",
       "args": [
@@ -19,4 +27,4 @@
     }
   },
   "contextFileName": "CLOUD-SQL-POSTGRESQL.md"
-}
+}