Extract text from imported (PDF / Word / Office) files

Being able to search inside the PDF files uploaded to Atomic Server would be a really nice addition.

Goals:

• Make it easier to find PDF documents by searching for terms that occur inside them
• Lightweight
• Fast
• Runs in background, may fail. Should not slow down upload process.
• OCR, if missing in the original PDF, would be a decent addition. But only if other goals are met.
• Bonus points if it also turns other doc types (e.g. docx) to plaintext
• Output should be plaintext or (preferably) markdown

Non-goals:

• Extract data from tables in PDFs

There are some tools that could help with this:

• pdf-extract rust crate
• ooxml-rs openXML (.docx .xlsx .pptx / word powerpoint excel) rust parser
• pdf-to-markdown (JS, so should run client-side!)

Start by evaluating the listed Rust crates, especially pdf-extract and ooxml-rs, alongside the suggested pdf-to-markdown tool. Define a lightweight background extraction path whose plaintext or Markdown output is searchable without slowing uploads; PDF text extraction is the core done condition, while OCR and other office formats are optional.