fix: prevent HF Space OOM crashes by caching OCR engines#12
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chore: promote dev to main (HF Space Crash Fix)
- In `OCRFactory`, cached instantiated engines in `_instances` dict to prevent multi-GB memory leaks on every Gradio request. - Explicitly disabled `use_gpu` and `show_log` during `PaddleOCR` initialization to minimize host probing and stdout noise in constrained environments.
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Fixes 'Memory limit exceeded (16Gi)' crashes by globally caching instantiated PyTorch/Paddle inference sessions in OCRFactory, preventing unbounded memory leaks on repetitive Gradio requests.