chore: add MCP integration and refactor documentation into modular how-to guides

- Moved GraphQL query samples into a new `docs/queries` directory for better organization.
- Added new queries and mutations, including `createHost.graphql` and `GetApiVersion.graphql`.
- Introduced `mcp-config.yaml` and updated `docker-compose.yml` for MCP integration.
- Updated IntelliJ `.idea/workspace.xml` settings to reflect project changes.
- Added new how-to guides (`docs/howtos`) for permissions, tags, MCP integration, and schema usage.
- Enhanced tests by updating file paths and improving sample data locations.
- Refined permissions and host group structures in `zabbix-hostgroups.ts` and `resolvers.ts`.

docs/howtos/README.md

@@ -0,0 +1,24 @@
+# How-To Guides
+
+This directory contains detailed guides on how to use and extend the Zabbix GraphQL API.
+
+## Available Guides
+
+### 📊 [Schema and Schema Extension](./schema.md)
+Learn about the GraphQL schema structure, how Zabbix entities map to GraphQL types, and how to use the dynamic schema extension system.
+
+### 🗂️ [Hierarchical Data Mapping](./hierarchical_data_mapping.md)
+Understand how the API automatically maps flat Zabbix item keys into nested GraphQL objects using hierarchical resolvers and type hinting.
+
+### 🔐 [Roles and Permissions Extension](./permissions.md)
+Discover how the permission system works, how to define permission levels using Zabbix template groups, and how to query user permissions.
+
+### 🏷️ [Zabbix Tags Usage](./tags.md)
+Learn how Zabbix tags are used for device classification, host categorization, and as metadata within the GraphQL API.
+
+### 🤖 [MCP Integration](./mcp.md)
+Discover how to integrate the Zabbix GraphQL API with the Model Context Protocol (MCP) to enable LLMs to interact with your Zabbix data.
+
+---
+
+For practical examples of GraphQL operations, check the [Sample Queries](../queries/) directory.