feat: 完成P13治理收尾并创建P14执行合同（Issue: P13-1,P13-2,P13-3,P13-4,P13-5,P13-6,P13-7,P13-8,P14-0）

server/tests/unit/featureFlags.sanitize.test.js

@@ -0,0 +1,18 @@
+const { sanitizeDepartmentIds } = require("../../src/services/featureFlags");
+
+describe("sanitizeDepartmentIds", () => {
+  it("returns empty array when input is not array", () => {
+    expect(sanitizeDepartmentIds(null)).toEqual([]);
+    expect(sanitizeDepartmentIds("dept")).toEqual([]);
+  });
+
+  it("trims ids, removes empty values and deduplicates", () => {
+    const value = ["  dept-a  ", "dept-b", "", "dept-a", "   "];
+    expect(sanitizeDepartmentIds(value)).toEqual(["dept-a", "dept-b"]);
+  });
+
+  it("filters non-string items", () => {
+    const value = ["dept-a", 1, true, { id: "dept-b" }, "dept-c"];
+    expect(sanitizeDepartmentIds(value)).toEqual(["dept-a", "dept-c"]);
+  });
+});