[WIP] Add endpoint for ID card image upload and field extraction

[Copilot]

• Install Tesseract.js dependency for OCR functionality
• Create controllers/credentials.js with endpoint logic for image upload and OCR extraction
• Create routes/credentials.js with POST endpoint for uploading ID card images
• Update server.js to register the new credentials route
• Create media/credenciales/ directory for storing uploaded images
• Add regex/string search to extract afiliacion, folio, and pensionado fields from OCR output
• Add tests for the new endpoint
• Update .gitignore to exclude uploaded credential images
• Verify the implementation manually

Original prompt

Create an endpoint that receives an uploaded image of an ID card, saves it on the server, and extracts three fields using OCR with Tesseract: afiliacion, folio, pensionado (or pension depending on detected text).
Save file to:
media/credenciales/<generated_filename>.jpg
"Afiliación" → return as afiliacion

"Folio" → return as folio

"Pensionado" or "Pensión" → return as pensionado

Use regex or string search to extract values from the OCR output.

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