refactor(ocr): 统一使用 SupportedOcrFile 类型替换 FileMetadata

更新 OCR 服务及其 Tesseract 实现，使用 SupportedOcrFile 类型替代原有的 FileMetadata 类型，以提高类型安全性和一致性。同时在 OcrService 中添加重复注册的警告日志。

src/main/services/ocr/OcrService.ts

@@ -1,13 +1,19 @@
-import { BuiltinOcrProviderIds, FileMetadata, OcrProvider, OcrResult, SupportedOcrFile } from '@types'
+import { loggerService } from '@logger'
+import { BuiltinOcrProviderIds, OcrProvider, OcrResult, SupportedOcrFile } from '@types'
 
 import { tesseractService } from './tesseract/TesseractService'
 
-type OcrHandler = (file: FileMetadata) => Promise<OcrResult>
+type OcrHandler = (file: SupportedOcrFile) => Promise<OcrResult>
+
+const logger = loggerService.withContext('OcrService')
 
 export class OcrService {
   private registry: Map<string, OcrHandler> = new Map()
 
   register(providerId: string, handler: OcrHandler): void {
+    if (this.registry.has(providerId)) {
+      logger.warn(`Provider ${providerId} has existing handler. Overwrited.`)
+    }
     this.registry.set(providerId, handler)
   }
 

src/main/services/ocr/tesseract/TesseractService.ts

@@ -1,7 +1,7 @@
 import { loggerService } from '@logger'
 import { getIpCountry } from '@main/utils/ipService'
 import { MB } from '@shared/config/constant'
-import { FileMetadata, ImageFileMetadata, isImageFile, OcrResult } from '@types'
+import { ImageFileMetadata, isImageFile, OcrResult, SupportedOcrFile } from '@types'
 import { app } from 'electron'
 import fs from 'fs'
 import path from 'path'
@@ -149,7 +149,7 @@ export class TesseractService {
     return { text: result.data.text }
   }
 
-  async ocr(file: FileMetadata): Promise<OcrResult> {
+  async ocr(file: SupportedOcrFile): Promise<OcrResult> {
     if (!isImageFile(file)) {
       throw new Error('Only image files are supported currently')
     }