Add visual approval flow designer

app/data/approval-flow.json

@@ -0,0 +1,78 @@
+{
+  "id": "FLOW-2026-018",
+  "name": "采购申请审批",
+  "description": "适用于办公用品、软件服务及项目采购申请",
+  "status": "draft",
+  "version": "v1.6",
+  "updatedAt": "2026-08-07 14:30",
+  "nodes": [
+    {
+      "id": "start-1",
+      "type": "start",
+      "title": "发起人",
+      "description": "所有员工均可发起",
+      "approvers": ["全体员工"],
+      "mode": "single"
+    },
+    {
+      "id": "approval-1",
+      "type": "approval",
+      "title": "直属主管审批",
+      "description": "由发起人的直属主管审批",
+      "approvers": ["直属主管"],
+      "mode": "single"
+    },
+    {
+      "id": "condition-1",
+      "type": "condition",
+      "title": "采购金额判断",
+      "description": "根据含税采购总额自动分流",
+      "approvers": [],
+      "mode": "single",
+      "branches": [
+        {
+          "id": "branch-high",
+          "label": "金额 ≥ 5,000 元",
+          "expression": "totalAmount >= 5000",
+          "node": {
+            "id": "approval-finance",
+            "type": "approval",
+            "title": "财务负责人审批",
+            "description": "财务合规与预算审核",
+            "approvers": ["财务负责人", "部门负责人"],
+            "mode": "all"
+          }
+        },
+        {
+          "id": "branch-normal",
+          "label": "金额 < 5,000 元",
+          "expression": "totalAmount < 5000",
+          "node": {
+            "id": "approval-budget",
+            "type": "approval",
+            "title": "预算管理员审批",
+            "description": "确认预算科目与剩余额度",
+            "approvers": ["预算管理员"],
+            "mode": "single"
+          }
+        }
+      ]
+    },
+    {
+      "id": "cc-1",
+      "type": "cc",
+      "title": "抄送采购执行人",
+      "description": "审批通过后自动通知",
+      "approvers": ["采购专员", "申请人"],
+      "mode": "single"
+    },
+    {
+      "id": "end-1",
+      "type": "end",
+      "title": "流程结束",
+      "description": "生成采购执行单",
+      "approvers": [],
+      "mode": "single"
+    }
+  ]
+}