fix: Add default sort value to create_collection

Collections without sort field cause frontend error:
"Cannot read properties of null (reading 'field')"

Now sets {"field": "index", "direction": "asc"} as default.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/index.ts

@@ -39,7 +39,7 @@ async function main() {
   // Create MCP server with shared configuration
   const server = createMcpServer(pgClient.getPool(), {
     name: 'mcp-outline-postgresql',
-    version: '1.3.7'
+    version: '1.3.8'
   });
 
   // Connect stdio transport