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/types/n8n-api.ts

@@ -454,4 +454,82 @@ export interface ErrorSuggestion {
   title: string;
   description: string;
   confidence: 'high' | 'medium' | 'low';
+}
+
+// Data Table types
+export interface DataTableColumn {
+  name: string;
+  type?: 'string' | 'number' | 'boolean' | 'date' | 'json';
+}
+
+export interface DataTableColumnResponse {
+  id: string;
+  name: string;
+  type: 'string' | 'number' | 'boolean' | 'date' | 'json';
+  index: number;
+}
+
+export interface DataTable {
+  id: string;
+  name: string;
+  columns?: DataTableColumnResponse[];
+  projectId?: string;
+  createdAt?: string;
+  updatedAt?: string;
+}
+
+export interface DataTableRow {
+  id?: number;
+  createdAt?: string;
+  updatedAt?: string;
+  [columnName: string]: unknown;
+}
+
+export interface DataTableFilterCondition {
+  columnName: string;
+  condition: 'eq' | 'neq' | 'like' | 'ilike' | 'gt' | 'gte' | 'lt' | 'lte';
+  value?: any;
+}
+
+export interface DataTableFilter {
+  type?: 'and' | 'or';
+  filters: DataTableFilterCondition[];
+}
+
+export interface DataTableListParams {
+  limit?: number;
+  cursor?: string;
+}
+
+export interface DataTableRowListParams {
+  limit?: number;
+  cursor?: string;
+  filter?: string;
+  sortBy?: string;
+  search?: string;
+}
+
+export interface DataTableInsertRowsParams {
+  data: Record<string, unknown>[];
+  returnType?: 'count' | 'id' | 'all';
+}
+
+export interface DataTableUpdateRowsParams {
+  filter: DataTableFilter;
+  data: Record<string, unknown>;
+  returnData?: boolean;
+  dryRun?: boolean;
+}
+
+export interface DataTableUpsertRowParams {
+  filter: DataTableFilter;
+  data: Record<string, unknown>;
+  returnData?: boolean;
+  dryRun?: boolean;
+}
+
+export interface DataTableDeleteRowsParams {
+  filter: string;
+  returnData?: boolean;
+  dryRun?: boolean;
 }