refactor(backend): update data schemas

- schemas/orchestrator.py: update orchestrator schemas
- schemas/settings.py: update settings schemas
- schemas/user_agent.py: update user agent schemas

server/src/app/schemas/orchestrator.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+from datetime import datetime
 from typing import Any, Literal
 
 from pydantic import BaseModel, Field
@@ -12,6 +13,7 @@ OrchestratorStatus = Literal["succeeded", "blocked", "failed"]
 class OrchestratorRequest(BaseModel):
     source: OrchestratorSource = Field(description="请求来源。")
     user_id: str | None = Field(default=None, description="当前用户 ID，任务触发可为空。")
+    conversation_id: str | None = Field(default=None, description="多轮对话会话 ID。")
     message: str | None = Field(default=None, description="用户消息或任务描述。")
     task_id: str | None = Field(default=None, description="任务资产 ID，schedule 触发时优先使用。")
     context_json: dict[str, Any] = Field(
@@ -34,6 +36,7 @@ class OrchestratorTraceSummary(BaseModel):
 
 class OrchestratorResponse(BaseModel):
     run_id: str = Field(description="本次运行的唯一 run_id。")
+    conversation_id: str | None = Field(default=None, description="当前会话 ID。")
     selected_agent: OrchestratorAgent | None = Field(
         default=None,
         description="最终路由到的下游 Agent。",
@@ -44,3 +47,37 @@ class OrchestratorResponse(BaseModel):
     result: dict[str, Any] = Field(default_factory=dict, description="对前端可直接展示的最小结果。")
     requires_confirmation: bool = Field(default=False, description="是否需要用户或管理员确认。")
     trace_summary: OrchestratorTraceSummary = Field(description="简化后的 Trace 摘要。")
+
+
+class ConversationMessageRead(BaseModel):
+    id: str = Field(description="消息 ID。")
+    role: str = Field(description="消息角色。")
+    content: str = Field(description="消息正文。")
+    run_id: str | None = Field(default=None, description="关联运行 ID。")
+    message_json: dict[str, Any] = Field(default_factory=dict, description="扩展消息载荷。")
+    created_at: datetime | None = Field(default=None, description="消息创建时间。")
+
+
+class ConversationRead(BaseModel):
+    conversation_id: str = Field(description="会话 ID。")
+    user_id: str | None = Field(default=None, description="所属用户 ID。")
+    source: str | None = Field(default=None, description="来源。")
+    entry_source: str | None = Field(default=None, description="入口来源。")
+    title: str | None = Field(default=None, description="会话标题。")
+    last_run_id: str | None = Field(default=None, description="最近一次运行 ID。")
+    last_scenario: str | None = Field(default=None, description="最近场景。")
+    last_intent: str | None = Field(default=None, description="最近意图。")
+    draft_claim_id: str | None = Field(default=None, description="关联草稿单 ID。")
+    state_json: dict[str, Any] = Field(default_factory=dict, description="会话状态。")
+    message_count: int = Field(default=0, ge=0, description="消息数量。")
+    updated_at: datetime | None = Field(default=None, description="更新时间。")
+    messages: list[ConversationMessageRead] = Field(default_factory=list, description="历史消息。")
+
+
+class ConversationLookupResponse(BaseModel):
+    found: bool = Field(default=False, description="是否找到可恢复会话。")
+    conversation: ConversationRead | None = Field(default=None, description="会话详情。")
+
+
+class ConversationDeleteResponse(BaseModel):
+    deleted_count: int = Field(default=0, ge=0, description="删除的会话数量。")