fix: resolve TypeScript linting errors in Phase 3 test files

- Fixed tags format from object array to string array in all test files
- Added type assertions for response.data in get-workflow-details.test.ts
- Added non-null assertions for workflow.nodes in get-workflow.test.ts
- All TypeScript linting errors now resolved

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

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

tests/integration/n8n-api/workflows/get-workflow-minimal.test.ts

@@ -47,8 +47,8 @@ describe('Integration: handleGetWorkflowMinimal', () => {
         ...SIMPLE_WEBHOOK_WORKFLOW,
         name: createTestWorkflowName('Get Minimal - Inactive'),
         tags: [
-          { name: 'mcp-integration-test' },
-          { name: 'minimal-test' }
+          'mcp-integration-test',
+          'minimal-test'
         ]
       };
 
@@ -97,8 +97,8 @@ describe('Integration: handleGetWorkflowMinimal', () => {
         ...SIMPLE_WEBHOOK_WORKFLOW,
         name: createTestWorkflowName('Get Minimal - Active'),
         tags: [
-          { name: 'mcp-integration-test' },
-          { name: 'minimal-test-active' }
+          'mcp-integration-test',
+          'minimal-test-active'
         ]
       };