feat(headroom): activate/uninstall extras + fix interpreter detection

- find interpreter next to headroom binary so extras/version read correctly
- add on/off toggle to activate [code]/[ml] via proxy restart
- add uninstall action + live install log progress + ~1GB confirm modal

src/app/api/headroom/restart/route.js

@@ -0,0 +1,35 @@
+import { NextResponse } from "next/server";
+import { getSettings } from "@/lib/localDb";
+import { restartHeadroomProxy } from "@/lib/headroom/process";
+import { DEFAULT_HEADROOM_URL, isLoopbackHeadroomUrl } from "@/lib/headroom/detect";
+
+export const dynamic = "force-dynamic";
+
+function parsePortFromUrl(url) {
+  try {
+    const u = new URL(url);
+    const p = parseInt(u.port, 10);
+    if (p > 0 && p < 65536) return p;
+  } catch { /* ignore, fall through to default */ }
+  return null;
+}
+
+export async function POST() {
+  try {
+    const settings = await getSettings();
+    const url = settings.headroomUrl || DEFAULT_HEADROOM_URL;
+    if (!isLoopbackHeadroomUrl(url)) {
+      return NextResponse.json({ error: "External Headroom proxies must be started outside 9Router", code: "EXTERNAL_PROXY" }, { status: 400 });
+    }
+    const port = parsePortFromUrl(url) || 8787;
+    const result = await restartHeadroomProxy({
+      port,
+      codeAware: settings.headroomCodeAware === true,
+      kompress: settings.headroomKompress !== false,
+    });
+    return NextResponse.json({ success: true, ...result });
+  } catch (error) {
+    const status = error.code === "NOT_INSTALLED" ? 400 : 500;
+    return NextResponse.json({ error: error.message, code: error.code || null }, { status });
+  }
+}