feat: P4 ChannelAnalytics tab; P5 FromUrlModal + URL→draft in ChannelView

app/api/generate/from-url/route.js

@@ -0,0 +1,20 @@
+import { NextResponse } from 'next/server';
+import { requireUser } from '@/lib/session';
+import { engine } from '@/lib/engine';
+
+export async function POST(request) {
+  const user = await requireUser();
+  if (!user) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
+
+  const body = await request.json();
+  if (!body.channelId || !body.url) {
+    return NextResponse.json({ error: 'channelId and url required' }, { status: 400 });
+  }
+
+  try {
+    const data = await engine.generateFromUrl(user.id, body);
+    return NextResponse.json(data);
+  } catch (err) {
+    return NextResponse.json({ error: err.message }, { status: err.status || 500 });
+  }
+}