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.

assets/README.md

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+# Watermark image
+
+Place `watermark.png` here for the default bottom-right video overlay.
+
+Curated Pro typography fonts live in `fonts/` (run `node scripts/fetch-watermark-fonts.mjs`).
+The image should include the full attribution: "Uploaded through Songs2VID.com".
+If missing, FFmpeg falls back to bottom-right drawtext with the same message.

assets/fonts/README.md

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+# Watermark fonts
+
+Curated TTF assets for FFmpeg `drawtext` (OFL via Google Fonts).
+Refresh with `node scripts/fetch-watermark-fonts.mjs`.