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/tests/test_reimbursement_endpoints.py

@@ -113,6 +113,53 @@ def seed_claim(db: Session) -> tuple[ExpenseClaim, ExpenseClaimItem]:
     return claim, item
 
 
+def test_claim_standard_adjustment_endpoint_recalculates_and_marks_reviewer_notice() -> None:
+    client, session_factory = build_client()
+    with session_factory() as db:
+        claim, item = seed_claim(db)
+        claim.expense_type = "hotel"
+        claim.location = "北京"
+        claim.amount = Decimal("1000.00")
+        item.item_type = "hotel_ticket"
+        item.item_reason = "北京住宿"
+        item.item_location = "北京"
+        item.item_amount = Decimal("1000.00")
+        db.commit()
+        claim_id = claim.id
+        item_id = item.id
+
+    response = client.post(
+        f"/api/v1/reimbursements/claims/{claim_id}/standard-adjustment",
+        json={
+            "risks": [
+                {
+                    "risk_id": "risk-hotel-endpoint-1",
+                    "item_id": item_id,
+                    "title": "住宿超标待说明",
+                    "risk": "住宿票据金额超过职级标准。",
+                    "application_days": 2,
+                    "original_amount": "1000.00",
+                    "reimbursable_amount": "1000.00",
+                }
+            ]
+        },
+        headers={"x-auth-username": "emp-1", "x-auth-name": "Zhang San", "x-auth-grade": "P4"},
+    )
+
+    assert response.status_code == 200
+    payload = response.json()
+    assert payload["amount"] == "900.00"
+    standard_flag = next(
+        flag
+        for flag in payload["risk_flags_json"]
+        if isinstance(flag, dict) and flag.get("source") == "reimbursement_standard_adjustment"
+    )
+    assert standard_flag["original_amount"] == "1000.00"
+    assert standard_flag["reimbursable_amount"] == "900.00"
+    assert standard_flag["employee_absorbed_amount"] == "100.00"
+    assert standard_flag["visibility_scope"] == "leader"
+
+
 def test_claim_item_attachment_upload_preview_and_delete(monkeypatch, tmp_path) -> None:
     def fake_recognize(
         self,