feat: Add receipt parsing functionality with image and PDF support, including Tesseract OCR integration

backend/Dockerfile

@@ -19,6 +19,12 @@ FROM node:22-alpine AS runner
 WORKDIR /app
 ENV NODE_ENV=production
 
+# Tesseract OCR systempaket (krävs av tesseract.js)
+RUN apk add --no-cache \
+    tesseract-ocr \
+    tesseract-ocr-data-swe \
+    tesseract-ocr-data-eng
+
 COPY --from=builder /app/package.json ./package.json
 COPY --from=builder /app/node_modules ./node_modules
 COPY --from=builder /app/dist ./dist