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.

app/api/fonts/[key]/route.ts

@@ -0,0 +1,29 @@
+import { NextRequest, NextResponse } from "next/server";
+import fs from "fs/promises";
+import { CURATED_FONTS, isCuratedFontKey } from "@/lib/fonts";
+import { resolveCuratedFontPath } from "@/lib/fonts-server";
+
+export async function GET(
+  _req: NextRequest,
+  { params }: { params: Promise<{ key: string }> },
+) {
+  const { key } = await params;
+  if (!isCuratedFontKey(key)) {
+    return NextResponse.json({ error: "Unknown font" }, { status: 404 });
+  }
+
+  const fontPath = resolveCuratedFontPath(key);
+  try {
+    const buf = await fs.readFile(fontPath);
+    const meta = CURATED_FONTS.find((f) => f.key === key)!;
+    return new NextResponse(buf, {
+      headers: {
+        "Content-Type": "font/ttf",
+        "Content-Disposition": `inline; filename="${meta.file}"`,
+        "Cache-Control": "public, max-age=86400, immutable",
+      },
+    });
+  } catch {
+    return NextResponse.json({ error: "Font file not found" }, { status: 404 });
+  }
+}