fix: fix tool count in diagnostic test and rename n8n_create_data_table to n8n_create_datatable

- Update diagnostic test to expect 14 management tools and 21 total (was 13/20)
- Rename MCP tool from n8n_create_data_table to n8n_create_datatable to match
  n8n's own node naming convention (n8n-nodes-base.datatable)

Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en

https://claude.ai/code/session_01N9LRZy1t5jVisF1p7RXeR7

tests/unit/mcp/handlers-n8n-manager.test.ts

@@ -1102,10 +1102,10 @@ describe('handlers-n8n-manager', () => {
             enabled: true,
           },
           managementTools: {
-            count: 13,
+            count: 14,
             enabled: true,
           },
-          totalAvailable: 20,
+          totalAvailable: 21,
         },
       });
 

tests/unit/mcp/parameter-validation.test.ts

@@ -542,8 +542,8 @@ describe('Parameter Validation', () => {
       await expect(server.testExecuteTool('n8n_test_workflow', {}))
         .rejects.toThrow('Missing required parameters for n8n_test_workflow: workflowId');
 
-      await expect(server.testExecuteTool('n8n_create_data_table', {}))
-        .rejects.toThrow('Missing required parameters for n8n_create_data_table: name');
+      await expect(server.testExecuteTool('n8n_create_datatable', {}))
+        .rejects.toThrow('Missing required parameters for n8n_create_datatable: name');
 
       for (const tool of n8nToolsWithRequiredParams) {
         await expect(server.testExecuteTool(tool.name, tool.args))