Why is it that everyone now duplicates/vibe-codes PDF tool websites? It seems that there is one new each week for about half a year now with none providing any outstanding features over the others.
PDF already has the notion of portable collections (PDF 2.0 section 12.3.5). As far as I can determine this is very similar to what you do except that your pdfx format won't be supported by (major) PDF viewers/libraries.
Regarding "Important Notice on Third-Party Components": You are including AGPL components in your project which itself is AGPL.
Even if you distribute your part of the code under the commercial license, the components make - depending on how they are integrated into BentoPDF - the whole project AGPL again. So it might be possible that all your commercial customers are breaking the AGPL of the included components. For example, if your code directly calls code in the components, the integration is tight and AGPL would most certainly apply. If all you do is call the components as external binaries, then it is fine.