chore: add tests for schema and API config mocking

- Added unit tests for schema loader, mocking Config variables and resolvers.
- Added unit tests for Zabbix API configuration, verifying constants derived from Config.
- Mocked relevant modules and filesystem behaviors to enable isolated testing.
- Optimized imports on all files and include this within a new .junie/guidelines.md file

src/execution/template_importer.ts

@@ -1,4 +1,3 @@
-
 import {
     CreateTemplate,
     CreateTemplateGroup,
@@ -11,7 +10,6 @@ import {
     ZabbixCreateItemRequest,
     ZabbixCreateTemplateGroupRequest,
     ZabbixCreateTemplateRequest,
-    ZabbixQueryItemRequest,
     ZabbixQueryTemplateGroupRequest,
     ZabbixQueryTemplatesRequest
 } from "../datasources/zabbix-templates.js";