fix(tests): update tool count expectations for v2.26.0

Update handlers-n8n-manager.test.ts to expect new consolidated
tool counts (7/12/19) after v2.26.0 tool consolidation.

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

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

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

@@ -1068,14 +1068,14 @@ describe('handlers-n8n-manager', () => {
         },
         toolsAvailability: {
           documentationTools: {
-            count: 14,
+            count: 7,
             enabled: true,
           },
           managementTools: {
-            count: 17,
+            count: 12,
             enabled: true,
           },
-          totalAvailable: 31,
+          totalAvailable: 19,
         },
       });