feat: 新增风险图谱算法与系统仪表盘及操作反馈体系

后端新增风险图谱算法模块、风险观察与反馈服务、规则 DSL
校验器和可解释性引擎，完善系统仪表盘和财务仪表盘统计，
优化 agent 运行和编排执行链路，清理旧开发文档，前端新增
系统趋势、负载热力图等多种仪表盘图表组件，完善操作反馈
对话框和工作台日期选择器，优化报销创建和审批详情交互，
补充单元测试覆盖。

server/tests/test_agent_feedback_service.py

@@ -0,0 +1,80 @@
+from __future__ import annotations
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import Session, sessionmaker
+from sqlalchemy.pool import StaticPool
+
+from app.db.base import Base
+from app.schemas.agent_feedback import AgentFeedbackCreate
+from app.services.agent_feedback import AgentFeedbackService
+
+
+def build_session() -> Session:
+    engine = create_engine(
+        "sqlite+pysqlite:///:memory:",
+        connect_args={"check_same_thread": False},
+        poolclass=StaticPool,
+    )
+    Base.metadata.create_all(bind=engine)
+    session_factory = sessionmaker(bind=engine, autoflush=False, autocommit=False)
+    return session_factory()
+
+
+def test_agent_feedback_service_records_rating_and_low_reason() -> None:
+    with build_session() as db:
+        service = AgentFeedbackService(db)
+
+        feedback = service.create_feedback(
+            AgentFeedbackCreate(
+                run_id="run-feedback-001",
+                conversation_id="conv-feedback-001",
+                user_id="wenjing.li",
+                agent="user_agent",
+                source="user_message",
+                session_type="application",
+                operation_type="submit_application",
+                operation_status="succeeded",
+                rating=2,
+                reason="意图识别不准",
+                context_json={"route_reason": "model_route"},
+            )
+        )
+        summary = service.summarize_feedback(agent="user_agent", session_type="application")
+
+        assert feedback.feedback_id.startswith("fb_")
+        assert feedback.rating == 2
+        assert feedback.reason == "意图识别不准"
+        assert summary.total_feedback == 1
+        assert summary.average_rating == 2.0
+        assert summary.low_rating_count == 1
+        assert summary.rating_distribution["2"] == 1
+        assert summary.recent_low_feedback[0]["run_id"] == "run-feedback-001"
+
+
+def test_agent_feedback_summary_keeps_five_star_distribution() -> None:
+    with build_session() as db:
+        service = AgentFeedbackService(db)
+        for rating in (5, 4, 5):
+            service.create_feedback(
+                AgentFeedbackCreate(
+                    run_id=f"run-rating-{rating}",
+                    user_id="wenjing.li",
+                    agent="user_agent",
+                    session_type="expense",
+                    operation_status="succeeded",
+                    rating=rating,
+                )
+            )
+
+        summary = service.summarize_feedback(session_type="expense")
+
+        assert summary.total_feedback == 3
+        assert summary.average_rating == 4.67
+        assert summary.low_rating_count == 0
+        assert summary.rating_distribution == {
+            "1": 0,
+            "2": 0,
+            "3": 0,
+            "4": 1,
+            "5": 2,
+        }