feat: 完成 F18 审批规则维护（API+前端）\n\n- 新增 /api/approval-rules 管理接口（system.settings）并写审计\n- 前端新增审批规则页与菜单入口（system.settings）\n- 更新 P5 蓝图 v3 中 F18 状态为 DONE

server/src/app.js

@@ -26,6 +26,7 @@ const departmentsRoutes = require("./routes/departments");
 const employeesRoutes = require("./routes/employees");
 const expenseTypesRoutes = require("./routes/expenseTypes");
 const configReadRoutes = require("./routes/configRead");
+const approvalRulesRoutes = require("./routes/approvalRules");
 const notificationsRoutes = require("./routes/notifications");
 const { startDelegationRevokeJob } = require("./jobs/delegationRevokeJob");
 const { startOcrJob } = require("./jobs/ocrJob");
@@ -201,6 +202,7 @@ async function buildApp() {
   await app.register(departmentsRoutes, { prefix: "/api" });
   await app.register(expenseTypesRoutes, { prefix: "/api" });
   await app.register(configReadRoutes, { prefix: "/api" });
+  await app.register(approvalRulesRoutes, { prefix: "/api" });
   await app.register(notificationsRoutes, { prefix: "/api" });
 
   startDelegationRevokeJob(app);