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/src/app/schemas/agent_run.py

@@ -59,3 +59,21 @@ class AgentRunRead(BaseModel):
     finished_at: datetime | None
     tool_calls: list[AgentToolCallRead] = Field(default_factory=list)
     semantic_parse: SemanticParseRead | None = None
+
+
+class AgentRunStatsRead(BaseModel):
+    window_limit: int
+    total_runs: int
+    succeeded_runs: int
+    blocked_runs: int
+    failed_runs: int
+    tool_call_count: int
+    failed_tool_call_count: int
+    llm_call_count: int
+    failed_llm_call_count: int
+    model_fallback_count: int
+    model_guardrail_count: int
+    agents: dict[str, int] = Field(default_factory=dict)
+    statuses: dict[str, int] = Field(default_factory=dict)
+    tool_statuses: dict[str, int] = Field(default_factory=dict)
+    recent_errors: list[dict[str, Any]] = Field(default_factory=list)