feat: implement smoketest and extend host provisioning with template linking

- Add runSmoketest mutation to automate end-to-end verification.

- Add SmoketestExecutor and HostDeleter to support automated testing and cleanup.

- Extend createHost and importHosts to allow linking templates by name or ID.

- Update docs/howtos/cookbook.md with new recipe steps and AI/MCP guidance.

- Update .junie/guidelines.md with new verification and deployment standards.

- Add src/test/template_link.test.ts and update existing tests to cover new functionality.

- Regenerate GraphQL types to match schema updates.

mcp/operations/createVerificationHost.graphql

@@ -1,8 +1,9 @@
-mutation CreateVerificationHost($deviceKey: String!, $deviceType: String!, $groupNames: [String!]!) {
+mutation CreateVerificationHost($deviceKey: String!, $deviceType: String!, $groupNames: [String!]!, $templateNames: [String]) {
   importHosts(hosts: [{
     deviceKey: $deviceKey,
     deviceType: $deviceType,
-    groupNames: $groupNames
+    groupNames: $groupNames,
+    templateNames: $templateNames
   }]) {
     hostid
     message