feat: enhance tool descriptions for better Smithery.ai marketplace visibility

🔧 Tool Description Improvements:
- list_workflows: Detailed explanation of workflow overview capabilities
- create_workflow: Comprehensive description of programmatic workflow creation
- get_workflow: Clear explanation of workflow inspection functionality
- execute_workflow: Detailed manual execution trigger description
- update_workflow: Explanation of partial update capabilities
- activate_workflow: Clear description of workflow enablement process
- deactivate_workflow: Detailed explanation of workflow suspension
- delete_workflow: Warning about permanent deletion with use cases

📈 Benefits:
- Better tool discovery in Smithery.ai marketplace
- Clearer user understanding of each tool's purpose
- More informative tool playground experience
- Enhanced documentation for AI assistant integration

These enhanced descriptions will be reflected on the Smithery.ai server page
at https://smithery.ai/server/@makafeli/n8n-workflow-builder after redeployment.

Author: makafeli

README.md

@@ -1,6 +1,10 @@
 # n8n Workflow Builder MCP Server
 
 <div align="center">
+  <a href="https://smithery.ai/server/@makafeli/n8n-workflow-builder">
+    <img src="https://smithery.ai/badge/@makafeli/n8n-workflow-builder" alt="Smithery Server Badge" />
+  </a>
+  <br />
   <a href="https://glama.ai/mcp/servers/fhoynrlnpp">
     <img width="380" height="200" src="https://glama.ai/mcp/servers/fhoynrlnpp/badge" alt="n8n Workflow Builder Server MCP server" />
   </a>