Add documentation for all PDF tools

docs/tools/extract-attachments.md

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+---
+title: Extract Attachments
+description: Extract all embedded file attachments from one or more PDFs and download them as a ZIP archive.
+---
+
+# Extract Attachments
+
+Pull out every embedded attachment from one or more PDF files. All extracted files are bundled into a single ZIP archive for download.
+
+## How It Works
+
+1. Upload one or more PDF files that contain embedded attachments.
+2. Click **Extract Attachments**.
+3. The tool scans each PDF for document-level and page-level attachments.
+4. All found files are packaged into a ZIP archive and downloaded automatically.
+5. A status message confirms how many attachments were found and their total size.
+
+## Features
+
+- Batch extraction from multiple PDFs at once
+- Extracts both document-level and page-level attachments
+- Outputs a single ZIP file containing all extracted files
+- Displays total attachment count and combined file size
+- Clear status messages if no attachments are found
+
+## Use Cases
+
+- Recovering data files embedded in a report PDF
+- Pulling image assets out of a portfolio or specification document
+- Extracting supplementary materials from training or compliance PDFs
+- Auditing what files are embedded inside a batch of PDFs
+
+## Tips
+
+- If the tool reports no attachments, the PDF may contain embedded images or form data instead -- those are not file attachments. Use [Extract Images](./extract-images) for embedded images.
+- When processing multiple PDFs, all attachments from every file end up in one ZIP. File names are preserved from the original embeddings.
+
+## Related Tools
+
+- [Add Attachments](./add-attachments)
+- [Edit Attachments](./edit-attachments)
+- [Extract Images](./extract-images)