Refactor code structure for improved readability and maintainability

backend/app/services/rag/__init__.py

@@ -1,4 +1,3 @@
-# src/services/rag/__init__.py
 """RAG服务模块"""
 
 from .retriever import Retriever, retrieve_regulations
@@ -9,4 +8,4 @@ __all__ = [
     "Retriever", "retrieve_regulations",
     "ContextBuilder", "build_rag_context",
     "PromptTemplates", "get_prompt_template"
-]
+]

backend/app/services/rag/context_builder.py

@@ -1,4 +1,3 @@
-# src/services/rag/context_builder.py
 """RAG上下文构建服务 - 构建LLM输入上下文"""
 
 from typing import List, Dict, Optional

backend/app/services/rag/prompt_templates.py

@@ -1,4 +1,3 @@
-# src/services/rag/prompt_templates.py
 """RAG Prompt模板 - 合规问答专用Prompt"""
 
 from typing import Dict, Optional
@@ -293,4 +292,4 @@ def get_prompt_template(name: str) -> PromptTemplate:
     template = PromptTemplates.get_template(name)
     if not template:
         raise ValueError(f"不存在的模板: {name}")
-    return template
+    return template

backend/app/services/rag/retriever.py

@@ -1,4 +1,3 @@
-# src/services/rag/retriever.py
 """RAG检索服务 - 封装Milvus检索"""
 
 from typing import List, Dict, Optional, Any