feat：新增大屏存取发布接口

app/schemas/conversation.py

@@ -1,9 +1,15 @@
 """会话及对话轮次，用于多轮上下文和后续持久化"""
 
 from datetime import datetime
-from typing import Literal
+from typing import Annotated, Literal
 
-from pydantic import BaseModel
+from pydantic import BaseModel, StringConstraints
+
+from .base import NonBlankString
+
+Title = Annotated[
+    str, StringConstraints(strip_whitespace=True, min_length=1, max_length=100)
+]
 
 
 class Turn(BaseModel):
@@ -18,6 +24,15 @@ class Turn(BaseModel):
     created_at: datetime
 
 
+class ConversationCreate(BaseModel):
+    # 会话归属的大屏；不传则不归属任何大屏（兼容旧调用）
+    screen_id: NonBlankString | None = None
+
+
+class ConversationRename(BaseModel):
+    title: Title
+
+
 class ConversationCreated(BaseModel):
     conversation_id: str
 
@@ -31,9 +46,11 @@ class ConversationSummary(BaseModel):
     """历史会话列表项，只包含已产生对话的会话"""
 
     conversation_id: str
-    title: str  # 取自首轮用户输入，过长时截断
+    title: str  # 用户改过名用改的，否则取自首轮用户输入，过长时截断
+    screen_id: str | None = None
     updated_at: datetime  # 最近一轮对话的创建时间
 
 
 class ConversationList(BaseModel):
     conversations: list[ConversationSummary]
+    total: int  # 符合条件的会话总数（不受 limit / offset 影响），管理页翻页用