Refactor code structure for improved readability and maintainability

backend/app/services/llm/__init__.py

@@ -1,4 +1,3 @@
-# src/services/llm/__init__.py
 """LLM服务模块"""
 
 from .llm_factory import LLMFactory, get_llm_client
@@ -12,4 +11,4 @@ __all__ = [
     "BaseLLMClient", "LLMResponse", "LLMConfig", "LLMProvider",
     "DeepSeekClient", "QwenClient", "QwenVLClient",
     "DocumentSummarizer", "summarize_document", "DocumentSummary"
-]
+]

backend/app/services/llm/base_client.py

@@ -1,4 +1,3 @@
-# src/services/llm/base_client.py
 """LLM客户端基类 - 统一接口定义"""
 
 from abc import ABC, abstractmethod
@@ -113,4 +112,4 @@ class BaseLLMClient(ABC):
         # 中文字符约1.5 token，英文约0.25 token
         chinese_chars = sum(1 for c in text if '一' <= c <= '鿿')
         other_chars = len(text) - chinese_chars
-        return int(chinese_chars * 1.5 + other_chars * 0.25)
+        return int(chinese_chars * 1.5 + other_chars * 0.25)

backend/app/services/llm/deepseek_client.py

@@ -1,4 +1,3 @@
-# src/services/llm/deepseek_client.py
 """DeepSeek LLM客户端 - OpenAI兼容API"""
 
 import time

backend/app/services/llm/document_summarizer.py

@@ -1,4 +1,3 @@
-# src/services/llm/document_summarizer.py
 """文档摘要生成服务 - LLM生成法规文档摘要"""
 
 from typing import Dict, Optional

backend/app/services/llm/llm_factory.py

@@ -1,4 +1,3 @@
-# src/services/llm/llm_factory.py
 """LLM工厂 - 统一创建和管理LLM客户端"""
 
 from typing import Optional, Dict, Any

backend/app/services/llm/qwen_client.py

@@ -1,4 +1,3 @@
-# src/services/llm/qwen_client.py
 """Qwen LLM客户端 - 支持OpenAI兼容API格式"""
 
 import time