update

backend/models.py

@@ -90,3 +90,12 @@ class GuideChatRequest(BaseModel):
 
 class GuideChatResponse(BaseModel):
     reply: str
+
+
+class ProgressUpdate(BaseModel):
+    chapter: str = Field(min_length=1, max_length=100)
+    done: bool
+
+
+class ProgressResponse(BaseModel):
+    chapters: list[str]