Align preview typography with FFmpeg output, add video/song title split, and ship OSS updates.

Separate YouTube video titles from on-video song/artist fields with Pro gating, serve curated fonts and watermark assets for 1:1 preview parity, and include billing/API/docs/deploy stack for self-hosted release.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/api/account/delete/route.ts

@@ -0,0 +1,14 @@
+import { NextResponse } from "next/server";
+import { prisma } from "@/lib/db";
+import { getSessionUser } from "@/lib/session";
+
+export async function POST() {
+  const user = await getSessionUser();
+  if (!user) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+
+  await prisma.user.delete({ where: { id: user.id } });
+
+  return NextResponse.json({ ok: true });
+}