feat(query-optimization): implement GraphQL query optimization and enhance regression suite

- **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.

src/api/graphql_utils.ts

@@ -0,0 +1,31 @@
+import {GraphQLResolveInfo, FieldNode, FragmentDefinitionNode, InlineFragmentNode} from "graphql";
+
+export function getRequestedFields(info: GraphQLResolveInfo): string[] {
+    if (!info || !info.fieldNodes) return [];
+    const fields: string[] = [];
+    const fieldNode = info.fieldNodes[0];
+
+    function extractFields(selectionSet: any, prefix: string = "") {
+        if (!selectionSet) return;
+        for (const selection of selectionSet.selections) {
+            if (selection.kind === 'Field') {
+                const fieldName = (selection as FieldNode).name.value;
+                const fullPath = prefix ? `${prefix}.${fieldName}` : fieldName;
+                fields.push(fullPath);
+                if (selection.selectionSet) {
+                    extractFields(selection.selectionSet, fullPath);
+                }
+            } else if (selection.kind === 'InlineFragment') {
+                extractFields((selection as InlineFragmentNode).selectionSet, prefix);
+            } else if (selection.kind === 'FragmentSpread') {
+                const fragment = info.fragments[selection.name.value];
+                if (fragment) {
+                    extractFields(fragment.selectionSet, prefix);
+                }
+            }
+        }
+    }
+
+    extractFields(fieldNode.selectionSet);
+    return fields;
+}