feat: add n8n_manage_datatable MCP tool with full CRUD (#640) (#650)

* feat: add n8n_create_data_table MCP tool and projectId for create workflow (#640)

Add new MCP tool to create n8n data tables via the REST API:
- n8n_create_data_table tool definition with name + columns schema
- handleCreateDataTable handler with Zod validation and N8nApiError handling
- N8nApiClient.createDataTable() calling POST /data-tables
- DataTable, DataTableColumn, DataTableColumnResponse types per OpenAPI spec
- Column types: string | number | boolean | date | json
- Input validation: .min(1) on table name and column names
- Tool documentation with examples, use cases, and pitfalls

Also adds projectId parameter to n8n_create_workflow for enterprise
project support, and fixes stale management tool count in health check.

Based on work by @djakielski in PR #646.
Co-Authored-By: Dominik Jakielski <dominik.jakielski@urlaubsguru.de>

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

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

* feat: replace n8n_create_data_table with n8n_manage_datatable (10 actions)

Replaces the single-purpose n8n_create_data_table tool with a comprehensive
n8n_manage_datatable tool covering all 10 n8n data table API endpoints:

Table operations: createTable, listTables, getTable, updateTable, deleteTable
Row operations: getRows, insertRows, updateRows, upsertRows, deleteRows

- Filter system with and/or logic and 8 condition operators
- Dry-run support for updateRows, upsertRows, deleteRows
- Pagination, sorting, and full-text search for row listing
- 9 new N8nApiClient methods for all data table endpoints
- Shared error handler and consolidated Zod schemas
- Comprehensive tool documentation with examples per action
- 36 handler tests + 18 API client tests

BREAKING: n8n_create_data_table removed. Use n8n_manage_datatable with
action="createTable" instead.

Based on work by @djakielski in PR #646.
Co-Authored-By: Dominik Jakielski <dominik.jakielski@urlaubsguru.de>

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

src/services/n8n-api-client.ts

@@ -22,6 +22,15 @@ import {
   SourceControlStatus,
   SourceControlPullResult,
   SourceControlPushResult,
+  DataTable,
+  DataTableColumn,
+  DataTableListParams,
+  DataTableRow,
+  DataTableRowListParams,
+  DataTableInsertRowsParams,
+  DataTableUpdateRowsParams,
+  DataTableUpsertRowParams,
+  DataTableDeleteRowsParams,
 } from '../types/n8n-api';
 import { handleN8nApiError, logN8nError } from '../utils/n8n-errors';
 import { cleanWorkflowForCreate, cleanWorkflowForUpdate } from './n8n-validation';
@@ -582,6 +591,95 @@ export class N8nApiClient {
     }
   }
 
+  async createDataTable(params: { name: string; columns?: DataTableColumn[] }): Promise<DataTable> {
+    try {
+      const response = await this.client.post('/data-tables', params);
+      return response.data;
+    } catch (error) {
+      throw handleN8nApiError(error);
+    }
+  }
+
+  async listDataTables(params: DataTableListParams = {}): Promise<{ data: DataTable[]; nextCursor?: string | null }> {
+    try {
+      const response = await this.client.get('/data-tables', { params });
+      return this.validateListResponse<DataTable>(response.data, 'data-tables');
+    } catch (error) {
+      throw handleN8nApiError(error);
+    }
+  }
+
+  async getDataTable(id: string): Promise<DataTable> {
+    try {
+      const response = await this.client.get(`/data-tables/${id}`);
+      return response.data;
+    } catch (error) {
+      throw handleN8nApiError(error);
+    }
+  }
+
+  async updateDataTable(id: string, params: { name: string }): Promise<DataTable> {
+    try {
+      const response = await this.client.patch(`/data-tables/${id}`, params);
+      return response.data;
+    } catch (error) {
+      throw handleN8nApiError(error);
+    }
+  }
+
+  async deleteDataTable(id: string): Promise<void> {
+    try {
+      await this.client.delete(`/data-tables/${id}`);
+    } catch (error) {
+      throw handleN8nApiError(error);
+    }
+  }
+
+  async getDataTableRows(id: string, params: DataTableRowListParams = {}): Promise<{ data: DataTableRow[]; nextCursor?: string | null }> {
+    try {
+      const response = await this.client.get(`/data-tables/${id}/rows`, { params });
+      return this.validateListResponse<DataTableRow>(response.data, 'data-table-rows');
+    } catch (error) {
+      throw handleN8nApiError(error);
+    }
+  }
+
+  async insertDataTableRows(id: string, params: DataTableInsertRowsParams): Promise<any> {
+    try {
+      const response = await this.client.post(`/data-tables/${id}/rows`, params);
+      return response.data;
+    } catch (error) {
+      throw handleN8nApiError(error);
+    }
+  }
+
+  async updateDataTableRows(id: string, params: DataTableUpdateRowsParams): Promise<any> {
+    try {
+      const response = await this.client.patch(`/data-tables/${id}/rows/update`, params);
+      return response.data;
+    } catch (error) {
+      throw handleN8nApiError(error);
+    }
+  }
+
+  async upsertDataTableRow(id: string, params: DataTableUpsertRowParams): Promise<any> {
+    try {
+      const response = await this.client.post(`/data-tables/${id}/rows/upsert`, params);
+      return response.data;
+    } catch (error) {
+      throw handleN8nApiError(error);
+    }
+  }
+
+  async deleteDataTableRows(id: string, params: DataTableDeleteRowsParams): Promise<any> {
+    try {
+      const response = await this.client.delete(`/data-tables/${id}/rows/delete`, { params });
+      return response.data;
+    } catch (error) {
+      throw handleN8nApiError(error);
+    }
+  }
+
   /**
    * Validates and normalizes n8n API list responses.
    * Handles both modern format {data: [], nextCursor?: string} and legacy array format.