Fix SSE route dependency and align architecture docs

backend/app/schemas/rag.py

@@ -1,13 +1,19 @@
+"""Define schema models for rag."""
+
 from pydantic import BaseModel
 from typing import Optional
+# Group related schema definitions so validation rules stay consistent.
+
 
 
 class RagChatRequest(BaseModel):
+    """Define the Rag Chat Request API model."""
     query: str
     top_k: int = 5
 
 
 class RetrievedDoc(BaseModel):
+    """Define the Retrieved Doc API model."""
     id: str
     doc_name: str
     clause_id: Optional[str] = None
@@ -17,15 +23,18 @@ class RetrievedDoc(BaseModel):
 
 
 class SourceInfo(BaseModel):
+    """Define the Source Info API model."""
     name: str
     clause: Optional[str] = None
 
 
 class QuickQuestion(BaseModel):
+    """Define the Quick Question API model."""
     id: str
     question: str
     category: str
 
 
 class QuickQuestionsResponse(BaseModel):
+    """Define the Quick Questions Response API model."""
     questions: list[QuickQuestion]