- **Optimization**: Implemented automatic Zabbix parameter optimization by analyzing GraphQL selection sets.
- **ZabbixRequest**: Added optimizeZabbixParams with support for skippable parameters and implied field dependencies (e.g., state -> items).
- **Resolvers**: Updated allHosts, allDevices, allHostGroups, and templates to pass requested fields to data sources.
- **Data Sources**: Optimized ZabbixQueryHostsGenericRequest and ZabbixQueryTemplatesRequest to skip unnecessary Zabbix API calls.
- **Regression Tests**: Enhanced RegressionTestExecutor with new tests for optimization (REG-OPT, REG-OPT-NEG), state retrieval (REG-STATE), dependent items (REG-DEP), and empty results (REG-EMPTY).
- **Documentation**: Created query_optimization.md How-To guide and updated roadmap.md, README.md, and tests.md.
- **Bug Fixes**: Fixed deviceType tag assignment during host import and corrected ZabbixCreateHostRequest to support tags.
