fix: add sharp dependency for image processing and improve ocr (#9554)

build: add sharp dependency for image processing

* Added sharp as a dependency in package.json to enhance image processing capabilities.
* Removed sharp from the devDependencies section.
* Refactored OCR image preprocessing by integrating grayscale and normalization directly into the process, improving overall efficiency.

src/main/utils/ocr.ts

@@ -7,8 +7,6 @@ const preprocessImage = async (buffer: Buffer) => {
     .grayscale() // 转为灰度
     .normalize()
     .sharpen()
-    .threshold(100) // 可能需要根据具体图片调整
-    .png({ quality: 100 })
     .toBuffer()
 }