feat: templates shell APT + rendu Mustache

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/templates/render.ts

@@ -0,0 +1,16 @@
+// server/templates/render.ts
+import Mustache from "mustache";
+import { readFileSync } from "node:fs";
+import { resolve } from "node:path";
+
+const TEMPLATES_ROOT = resolve(process.cwd(), "templates");
+
+export interface TemplateVars {
+  aptProxy?: string | null;
+}
+
+export function renderTemplate(relPath: string, vars: TemplateVars): string {
+  const tpl = readFileSync(resolve(TEMPLATES_ROOT, relPath), "utf8");
+  // Mustache échappe le HTML par défaut; on désactive (ce sont des scripts shell).
+  return Mustache.render(tpl, vars, {}, { escape: (s) => s });
+}