refactor(whisper_server): 重构代码以模块化转录功能

将转录核心逻辑拆分为独立模块（transcriber.py、model_manager.py、audio_processor.py、formatters.py），提升代码可维护性和复用性。删除main.py文件，优化依赖管理并更新requirements.txt和pyproject.toml。

formatters.py

@@ -0,0 +1,131 @@
+#!/usr/bin/env python3
+"""
+格式化输出模块
+负责将转录结果格式化为不同的输出格式（VTT、SRT、JSON）
+"""
+
+import json
+from typing import List, Dict, Any
+
+def format_vtt(segments: List) -> str:
+    """
+    将转录结果格式化为VTT
+
+    Args:
+        segments: 转录段落列表
+
+    Returns:
+        str: VTT格式的字幕内容
+    """
+    vtt_content = "WEBVTT\n\n"
+
+    for segment in segments:
+        start = format_timestamp(segment.start)
+        end = format_timestamp(segment.end)
+        text = segment.text.strip()
+
+        if text:
+            vtt_content += f"{start} --> {end}\n{text}\n\n"
+
+    return vtt_content
+
+def format_srt(segments: List) -> str:
+    """
+    将转录结果格式化为SRT
+
+    Args:
+        segments: 转录段落列表
+
+    Returns:
+        str: SRT格式的字幕内容
+    """
+    srt_content = ""
+    index = 1
+
+    for segment in segments:
+        start = format_timestamp_srt(segment.start)
+        end = format_timestamp_srt(segment.end)
+        text = segment.text.strip()
+
+        if text:
+            srt_content += f"{index}\n{start} --> {end}\n{text}\n\n"
+            index += 1
+
+    return srt_content
+
+def format_json(segments: List, info: Any) -> str:
+    """
+    将转录结果格式化为JSON
+
+    Args:
+        segments: 转录段落列表
+        info: 转录信息对象
+
+    Returns:
+        str: JSON格式的转录结果
+    """
+    result = {
+        "segments": [{
+            "id": i,
+            "start": segment.start,
+            "end": segment.end,
+            "text": segment.text.strip(),
+            "words": [{
+                "word": word.word,
+                "start": word.start,
+                "end": word.end,
+                "probability": word.probability
+            } for word in segment.words] if hasattr(segment, 'words') and segment.words else []
+        } for i, segment in enumerate(segments)],
+        "language": info.language,
+        "language_probability": info.language_probability if hasattr(info, 'language_probability') else None,
+        "duration": info.duration,
+        "all_language_probs": info.all_language_probs if hasattr(info, 'all_language_probs') else None
+    }
+    return json.dumps(result, indent=2, ensure_ascii=False)
+
+def format_timestamp(seconds: float) -> str:
+    """
+    格式化时间戳为VTT格式
+
+    Args:
+        seconds: 秒数
+
+    Returns:
+        str: 格式化的时间戳 (HH:MM:SS.mmm)
+    """
+    hours = int(seconds // 3600)
+    minutes = int((seconds % 3600) // 60)
+    seconds = seconds % 60
+    return f"{hours:02d}:{minutes:02d}:{seconds:06.3f}"
+
+def format_timestamp_srt(seconds: float) -> str:
+    """
+    格式化时间戳为SRT格式
+
+    Args:
+        seconds: 秒数
+
+    Returns:
+        str: 格式化的时间戳 (HH:MM:SS,mmm)
+    """
+    hours = int(seconds // 3600)
+    minutes = int((seconds % 3600) // 60)
+    secs = int(seconds % 60)
+    msecs = int((seconds - int(seconds)) * 1000)
+    return f"{hours:02d}:{minutes:02d}:{secs:02d},{msecs:03d}"
+
+def format_time(seconds: float) -> str:
+    """
+    格式化时间为可读格式
+
+    Args:
+        seconds: 秒数
+
+    Returns:
+        str: 格式化的时间 (HH:MM:SS)
+    """
+    hours = int(seconds // 3600)
+    minutes = int((seconds % 3600) // 60)
+    secs = int(seconds % 60)
+    return f"{hours:02d}:{minutes:02d}:{secs:02d}"