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/services/account_behavior_profile.py

@@ -44,8 +44,10 @@ class AccountBehaviorProfileService(EmployeeBehaviorProfileMetricHelpers):
                 empty_reason="当前账号未匹配员工目录，无法形成审批场景员工画像。",
             )
 
-        runs = self._fetch_account_runs(identifiers, datetime.now(UTC) - timedelta(days=window_days))
-        if not runs:
+        cutoff = datetime.now(UTC) - timedelta(days=window_days)
+        runs = self._fetch_account_runs(identifiers, cutoff)
+        usage_duration_metrics = self._resolve_usage_duration_metrics(identifiers, cutoff, runs)
+        if not runs and not usage_duration_metrics["online_duration_ms"]:
             return EmployeeProfileLatestRead(
                 employee_id=account_id,
                 employee_name=account_name,
@@ -57,6 +59,7 @@ class AccountBehaviorProfileService(EmployeeBehaviorProfileMetricHelpers):
 
         result = self._calculate_account_ai_usage_profile(
             runs=runs,
+            usage_duration_metrics=usage_duration_metrics,
             window_days=window_days,
             expense_type_scope=expense_type_scope,
         )
@@ -100,6 +103,7 @@ class AccountBehaviorProfileService(EmployeeBehaviorProfileMetricHelpers):
         self,
         *,
         runs: list[AgentRun],
+        usage_duration_metrics: dict[str, Any],
         window_days: int,
         expense_type_scope: str,
     ):
@@ -108,7 +112,6 @@ class AccountBehaviorProfileService(EmployeeBehaviorProfileMetricHelpers):
             tool for tool in tool_calls if str(tool.status or "").lower() not in {"success", "ok"}
         ]
         estimated_tokens = self._estimate_tokens(runs)
-        duration_ms = self._sum_agent_run_duration_ms(runs)
         token_mode = "estimated_token_count" if estimated_tokens else "unavailable"
 
         return evaluate_weighted_profile(
@@ -159,8 +162,7 @@ class AccountBehaviorProfileService(EmployeeBehaviorProfileMetricHelpers):
                 "token_count_mode": token_mode,
                 "estimated_token_count": estimated_tokens,
                 "exact_token_count": None,
-                "ai_run_duration_ms": duration_ms,
-                "ai_run_duration_mode": "elapsed_or_tool_call_fallback",
+                **usage_duration_metrics,
             },
         )