feat: adapt rapidocr v2

[SWHL]

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[Copilot]

Pull Request Overview

This PR adapts rapidocr to v2 by unifying backend selection and updating example usage.

• Removed the extras_require block in setup.py that previously provided optional dependencies for different backends.
• Replaced the conditional backend imports in rapidocr_api/main.py with a unified import from rapidocr and updated OCR result processing.
• Updated demo.py to use perf_counter for more precise time measurement and increased HTTP request timeouts.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
setup.py	Removed the extras_require block to streamline dependency management.
rapidocr_api/main.py	Simplified backend import and altered OCR result processing via zip over result lists.
demo.py	Updated timing functions and extended timeout values for HTTP requests.

Comments suppressed due to low confidence (3)

setup.py:78

• Removal of the extras_require block eliminates optional dependencies for onnx, paddle, and openvino backends. Ensure that this change is intentional and that relevant documentation reflects this update.

extras_require={

rapidocr_api/main.py:50

• [nitpick] Using zip to iterate over ocr_res.boxes, ocr_res.txts, and ocr_res.scores assumes these lists are of equal length. Consider handling potential mismatches if the lengths of these lists differ.

for i, (boxes, txt, score) in enumerate(zip(ocr_res.boxes, ocr_res.txts, ocr_res.scores)):

rapidocr_api/main.py:16

• The conditional backend imports have been replaced with a unified import. Confirm that the unified RapidOCR API reliably supports all backend functionalities previously handled by the conditional logic.

from rapidocr import RapidOCR