Fix SSE route dependency and align architecture docs

backend/app/schemas/doc.py

@@ -1,9 +1,14 @@
+"""Define schema models for doc."""
+
 from pydantic import BaseModel
 from typing import Optional
 from datetime import datetime
+# Group related schema definitions so validation rules stay consistent.
+
 
 
 class DocumentUploadResponse(BaseModel):
+    """Define the Document Upload Response API model."""
     doc_id: str
     filename: str
     size: int
@@ -11,6 +16,7 @@ class DocumentUploadResponse(BaseModel):
 
 
 class DocumentInfo(BaseModel):
+    """Define the Document Info API model."""
     id: str
     name: str
     chunks: int
@@ -19,10 +25,12 @@ class DocumentInfo(BaseModel):
 
 
 class DocumentListResponse(BaseModel):
+    """Define the Document List Response API model."""
     docs: list[DocumentInfo]
 
 
 class ChunkInfo(BaseModel):
+    """Define the Chunk Info API model."""
     chunk_id: str
     doc_name: str
     clause_id: Optional[str] = None
@@ -33,12 +41,14 @@ class ChunkInfo(BaseModel):
 
 
 class ParseResponse(BaseModel):
+    """Define the Parse Response API model."""
     doc_id: str
     chunks: int
     status: str = "parsed"
 
 
 class EmbedResponse(BaseModel):
+    """Define the Embed Response API model."""
     doc_id: str
     vectors: int
     status: str = "embedded"