feat: implement history push mutation and enhanced MCP logging

- Implement pushHistory mutation to support pushing telemetry data to Zabbix trapper items.

- Add VERBOSITY and MCP_LOG_* environment variables for controllable request/response logging in both API and MCP server.

- Enhance ZabbixRESTDataSource with better session handling and error logging.

- Update ZabbixHistory datasource to support history push operations.

- Expand documentation with new cookbook recipes and MCP integration guides.

- Add integration tests for history pushing (src/test/history_push*).

- Reorganize documentation, moving technical product info PDF to docs/use-cases/.

- Update GraphQL generated types and VCR templates.

docs/queries/sample_tracked_device_query.graphql

@@ -0,0 +1,19 @@
+### Query
+Retrieve the state of tracked devices.
+
+```graphql
+query GetSimulatedState {
+  allDevices(tag_deviceType: ["TrackedDevice"]) {
+    name
+    host
+    deviceType
+    ... on TrackedDevice {
+      state {
+        current {
+          geojson
+        }
+      }
+    }
+  }
+}
+```