fix: data tables available on all n8n plans, remove redundant pitfalls (#656)

Data tables are available on self-hosted n8n too, not just enterprise/cloud.
Removed incorrect availability restriction from tool description and docs.
Removed redundant pitfalls (API key requirement implicit, plan restriction wrong).

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

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/mcp/tool-docs/workflow_management/n8n-manage-datatable.ts

@@ -14,7 +14,7 @@ export const n8nManageDatatableDoc: ToolDocumentation = {
       'Use dryRun: true to preview update/upsert/delete before applying',
       'Filter supports: eq, neq, like, ilike, gt, gte, lt, lte conditions',
       'Use returnData: true to get affected rows back from update/upsert/delete',
-      'Requires n8n enterprise or cloud with data tables feature'
+      'Requires N8N_API_URL and N8N_API_KEY configured'
     ]
   },
   full: {
@@ -96,8 +96,6 @@ export const n8nManageDatatableDoc: ToolDocumentation = {
       'Use sortBy for deterministic row ordering',
     ],
     pitfalls: [
-      'Requires N8N_API_URL and N8N_API_KEY configured',
-      'Feature only available on n8n enterprise or cloud plans',
       'deleteTable permanently deletes all rows — cannot be undone',
       'deleteRows requires a filter — cannot delete all rows without one',
       'Column types cannot be changed after table creation via API',