Changes:
- Add process_task_ocr background function to execute OCR processing
- Initialize OCRService and process uploaded file
- Save OCR results to JSON and Markdown files
- Update task status to COMPLETED/FAILED based on processing outcome
- Use FastAPI BackgroundTasks for async processing
- Direct database updates in background task (bypass user isolation)
Features:
- Real OCR processing with GPU/CPU acceleration
- Processing time tracking
- Error handling and status updates
- Result files saved in task-specific directories
Fixes:
- Task status stuck in PROCESSING (no actual OCR execution)
- No CPU/GPU utilization during "processing"
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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