feat(ocr): embed searchable text layer for providers without native PDF output

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

Dockerfile

@@ -16,6 +16,18 @@ WORKDIR /app
 COPY --from=builder /usr/local/lib/python3.14/site-packages /usr/local/lib/python3.14/site-packages
 COPY --from=builder /usr/local/bin /usr/local/bin
 
+# Install system-level OCR tools required for local OCR workflows:
+#   tesseract-ocr   – OCR engine used by pytesseract and ocrmypdf
+#   ghostscript     – required by ocrmypdf for PDF/PS operations
+#   poppler-utils   – provides pdfinfo/pdftoppm used by pdf2image
+#   unpaper         – optional deskewing pre-processor used by ocrmypdf
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        tesseract-ocr \
+        ghostscript \
+        poppler-utils \
+        unpaper \
+    && apt-get clean && rm -rf /var/lib/apt/lists/*
+
 # Copy application code
 COPY ./app /app/app
 COPY ./frontend /app/frontend