Add EC2 Launch Template strain genesis for AWS horizontal scale.

Ship POST /api/v1/forge/launch-template with cloud-init user-data embedding genesis snapshot hash and strain card ID; first template-tagged auth pins SpreadGeneration=0 and ParentAgentID=template.

server/web/src/help/launchTemplateExport.ts

@@ -0,0 +1,46 @@
+export interface LaunchTemplateExportRequest {
+  server_url: string;
+  build_id?: string;
+  strain_card_id?: string;
+  campaign?: string;
+  ami_id?: string;
+  instance_type?: string;
+  region?: string;
+}
+
+export interface LaunchTemplateExportResponse {
+  success: boolean;
+  genesis_snapshot_hash: string;
+  strain_card_id: string;
+  launch_template_json: string;
+  user_data_sh: string;
+  asg_example_json: string;
+  error?: string;
+}
+
+export const LAUNCH_TEMPLATE_FILES = [
+  { id: 'launch-template', label: 'launch-template.json', field: 'launch_template_json' as const },
+  { id: 'user-data', label: 'user-data.sh', field: 'user_data_sh' as const },
+  { id: 'asg-example', label: 'asg-example.json', field: 'asg_example_json' as const },
+] as const;
+
+export function launchTemplateZipName(campaign?: string): string {
+  const slug = (campaign ?? '').trim().toLowerCase().replace(/[^a-z0-9._-]+/g, '-').replace(/^-+|-+$/g, '');
+  return slug ? `aetherforge-launch-template-${slug}.zip` : 'aetherforge-launch-template-genesis.zip';
+}
+
+export function downloadLaunchTemplateFile(
+  resp: LaunchTemplateExportResponse,
+  file: (typeof LAUNCH_TEMPLATE_FILES)[number]['field'],
+  filename: string,
+): void {
+  const content = resp[file];
+  if (!content) return;
+  const blob = new Blob([content], { type: file === 'user_data_sh' ? 'text/x-shellscript' : 'application/json' });
+  const url = URL.createObjectURL(blob);
+  const a = document.createElement('a');
+  a.href = url;
+  a.download = filename;
+  a.click();
+  URL.revokeObjectURL(url);
+}