chore: Web Worker Friendly Code

[rodrigo1991]

Chore: Add Web Worker Friendly Code, Update Models, Update OpenCV-JS

Summary

This PR refactors the OCR browser codebase to run OCR in a Web Worker, ensuring that image processing does not block the main UI thread. It also updates the ONNX models and refreshes the OpenCV-JS dependency.

Changes

• Refactored the OCR logic to create the Ocr instance once in a worker and reuse it across multiple images.
• Replaced Image based loading with fetch + createImageBitmap for worker compatibility.
• Updated detection and recognition models to the latest versions.
• Updated OpenCV-JS to the latest stable release.
• Updated the README to document the worker-friendly approach and provide usage instructions.

Benefits

• Non-blocking UI: Image processing and OCR run off the main thread.
• Reusable OCR instance: Models are loaded once per worker, improving performance.
• Modern API: Compatible with React/Next.js applications using module workers.
• Better maintainability: Clear separation between main thread and worker responsibilities.

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[gutenye]

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