feat: implement template cloning and extended item data retrieval

- Extend Template and ZabbixItem types in GraphQL schema to support full item hierarchy and cloning.

- Update ZabbixQueryTemplatesRequest in src/datasources/zabbix-templates.ts to fetch comprehensive item configurations (type, status, history, delay, units, preprocessing, tags).

- Implement raw value resolvers for ZabbixItem.type_int and ZabbixItem.status_int in src/api/resolvers.ts.

- Add new MCP operations: mcp/operations/getTemplates.graphql and mcp/operations/importTemplates.graphql for template management via AI agents.

- Add 'Cloning a Template with Items' recipe to docs/howtos/cookbook.md.

- Update src/test/template_query.test.ts to ensure compatibility with extended datasource output.

src/datasources/zabbix-templates.ts

@@ -1,12 +1,14 @@
-import {ZabbixRequest, ParsedArgs, isZabbixErrorResult} from "./zabbix-request.js";
+import {ZabbixRequest, ParsedArgs, isZabbixErrorResult, ZabbixParams} from "./zabbix-request.js";
 import {ZabbixAPI} from "./zabbix-api.js";
 import {logger} from "../logging/logger.js";
 
 
 export interface ZabbixQueryTemplateResponse {
     templateid: string,
+    host: string,
     uuid: string,
     name: string,
+    items?: any[]
 }
 
 
@@ -14,6 +16,14 @@ export class ZabbixQueryTemplatesRequest extends ZabbixRequest<ZabbixQueryTempla
     constructor(authToken?: string | null, cookie?: string | null,) {
         super("template.get", authToken, cookie);
     }
+
+    createZabbixParams(args?: ParsedArgs): ZabbixParams {
+        return {
+            "selectItems": "extend",
+            "output": "extend",
+            ...args?.zabbix_params
+        };
+    }
 }