docs: split document tools into pdf and files sections

apps/docs/tools/files/excel-to-pdf.md

@@ -0,0 +1,43 @@
+---
+description: Convert spreadsheets to PDF.
+---
+
+# Excel to PDF
+
+Convert Excel, OpenDocument, or CSV spreadsheets to PDF. Wide sheets may paginate across multiple pages.
+
+## API Endpoint
+
+`POST /api/v1/tools/excel-to-pdf`
+
+Accepts multipart form data with an Excel/ODS/CSV file.
+
+## Parameters
+
+This tool has no configurable parameters. Upload a spreadsheet and it will be converted to PDF.
+
+## Example Request
+
+```bash
+curl -X POST http://localhost:1349/api/v1/tools/excel-to-pdf \
+  -H "Authorization: Bearer si_your-api-key" \
+  -F "file=@budget.xlsx"
+```
+
+## Example Response
+
+Returns `202 Accepted`. Track progress via SSE at `/api/v1/jobs/{jobId}/progress`.
+
+```json
+{
+  "jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
+  "async": true
+}
+```
+
+## Notes
+
+- Accepted input formats: `.xlsx`, `.xls`, `.ods`, `.csv`.
+- Wide sheets may be split across multiple pages in the resulting PDF.
+- Charts and conditional formatting are rendered in the PDF output.
+- Conversion is handled by LibreOffice running headless on the server.