first commit

backend/app/transcriber/transcriber_provider.py

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+from app.transcriber.whisper import WhisperTranscriber
+print('实例化transcriber')
+# TODO:后面需要加入逻辑选择
+_transcriber = None
+
+def get_transcriber(model_size="base", device="cuda"):
+    global _transcriber
+    if _transcriber is None:
+        print('加载_transcriber')
+        _transcriber = WhisperTranscriber(model_size=model_size, device=device)
+    return _transcriber