feat: 报销预审会话状态管理与工作台交互增强

- 新增差旅报销会话状态管理与对话模型重构
- 增强风险观测服务与运行时聊天上下文作用域
- 优化工作台图标资源、助理意图识别与摘要工具
- 完善报销创建视图样式与差旅详情页标准调整交互
- 补充风险观测、运行时聊天与报销端点测试覆盖

server/src/app/schemas/steward.py

@@ -0,0 +1,90 @@
+from __future__ import annotations
+
+from typing import Any, Literal
+
+from pydantic import BaseModel, Field
+
+
+StewardTaskType = Literal["expense_application", "reimbursement"]
+StewardAssignedAgent = Literal["application_assistant", "reimbursement_assistant"]
+StewardPlanningSource = Literal["llm_function_call", "rule_fallback"]
+StewardTaskStatus = Literal[
+    "planned",
+    "needs_confirmation",
+    "ready_to_delegate",
+    "delegated",
+    "completed",
+    "blocked",
+]
+StewardConfirmationStatus = Literal["pending", "confirmed", "rejected"]
+
+
+class StewardAttachmentInput(BaseModel):
+    name: str = Field(description="附件原始文件名。")
+    media_type: str = Field(default="", description="附件 MIME 类型。")
+    ocr_summary: str = Field(default="", description="可选 OCR 摘要。")
+    ocr_fields: dict[str, Any] = Field(default_factory=dict, description="可选 OCR 结构化字段。")
+
+
+class StewardPlanRequest(BaseModel):
+    message: str = Field(description="用户在首页输入的自然语言任务。")
+    user_id: str | None = Field(default=None, description="当前用户 ID。")
+    client_now_iso: str | None = Field(default=None, description="客户端当前时间 ISO 字符串。")
+    attachments: list[StewardAttachmentInput] = Field(default_factory=list, description="随本次输入上传的附件。")
+    context_json: dict[str, Any] = Field(default_factory=dict, description="调用方上下文。")
+
+
+class StewardThinkingEvent(BaseModel):
+    event_id: str = Field(description="过程摘要事件 ID。")
+    stage: str = Field(description="阶段编码。")
+    title: str = Field(description="面向用户展示的阶段标题。")
+    content: str = Field(description="面向用户展示的过程摘要。")
+    status: str = Field(default="completed", description="事件状态。")
+
+
+class StewardTask(BaseModel):
+    task_id: str = Field(description="小财管家任务 ID。")
+    task_type: StewardTaskType = Field(description="任务类型。")
+    assigned_agent: StewardAssignedAgent = Field(description="建议分派的下游助手。")
+    title: str = Field(description="任务标题。")
+    summary: str = Field(description="任务摘要。")
+    status: StewardTaskStatus = Field(default="needs_confirmation", description="任务状态。")
+    confidence: float = Field(default=0.0, ge=0.0, le=1.0, description="识别置信度。")
+    ontology_fields: dict[str, str] = Field(default_factory=dict, description="归一化后的业务本体字段。")
+    missing_fields: list[str] = Field(default_factory=list, description="仍缺失的本体字段。")
+    confirmation_required: bool = Field(default=True, description="执行前是否需要用户确认。")
+
+
+class StewardAttachmentGroup(BaseModel):
+    group_id: str = Field(description="附件归集组 ID。")
+    target_task_id: str | None = Field(default=None, description="建议归属的任务 ID。")
+    scene: str = Field(description="归集场景编码。")
+    scene_label: str = Field(description="归集场景展示名。")
+    attachment_names: list[str] = Field(default_factory=list, description="建议纳入的附件名称。")
+    excluded_attachment_names: list[str] = Field(default_factory=list, description="建议排除或单独处理的附件名称。")
+    confidence: float = Field(default=0.0, ge=0.0, le=1.0, description="归集置信度。")
+    rationale: str = Field(default="", description="归集依据。")
+    confirmation_required: bool = Field(default=True, description="归集前是否需要用户确认。")
+
+
+class StewardConfirmationAction(BaseModel):
+    confirmation_id: str = Field(description="确认动作 ID。")
+    action_type: str = Field(description="确认动作类型。")
+    label: str = Field(description="确认按钮文案。")
+    description: str = Field(default="", description="确认动作说明。")
+    target_task_id: str | None = Field(default=None, description="关联任务 ID。")
+    attachment_group_id: str | None = Field(default=None, description="关联附件归集组 ID。")
+    status: StewardConfirmationStatus = Field(default="pending", description="确认状态。")
+    payload: dict[str, Any] = Field(default_factory=dict, description="确认后继续执行所需载荷。")
+
+
+class StewardPlanResponse(BaseModel):
+    plan_id: str = Field(description="小财管家计划 ID。")
+    plan_status: str = Field(default="needs_confirmation", description="计划状态。")
+    planning_source: StewardPlanningSource = Field(default="rule_fallback", description="计划生成来源。")
+    summary: str = Field(description="计划摘要。")
+    thinking_events: list[StewardThinkingEvent] = Field(default_factory=list, description="过程摘要事件。")
+    tasks: list[StewardTask] = Field(default_factory=list, description="拆解后的任务。")
+    attachment_groups: list[StewardAttachmentGroup] = Field(default_factory=list, description="附件归集建议。")
+    confirmation_groups: list[StewardConfirmationAction] = Field(default_factory=list, description="等待用户确认的动作。")
+    model_call_traces: list[dict[str, Any]] = Field(default_factory=list, description="模型工具调用轨迹。")