feat: 新增 target description 字段，收紧 id/name 长度，调整延迟列和名称列

tests/server/checker/store.test.ts

@@ -29,6 +29,7 @@ function targetId(store: ProbeStore, name: string): string {
 }
 
 const httpTarget: ResolvedHttpTarget = {
+  description: null,
   expect: { maxDurationMs: 3000, status: [200] },
   group: "default",
   http: {
@@ -54,6 +55,7 @@ const commandTarget: ResolvedCommandTarget = {
     exec: "ping",
     maxOutputBytes: 104857600,
   },
+  description: null,
   group: "default",
   id: "test-cmd",
   intervalMs: 60000,
@@ -364,6 +366,7 @@ describe("ProbeStore", () => {
   test("删除 target 级联删除 check_results", () => {
     const cascadeStore = new ProbeStore(join(tempDir, "cascade.db"));
     const cascadeTarget: ResolvedHttpTarget = {
+      description: null,
       group: "default",
       http: {
         headers: {},
@@ -427,6 +430,7 @@ describe("ProbeStore", () => {
     const freshStore = new ProbeStore(join(tempDir, "fresh-map.db"));
     freshStore.syncTargets([
       {
+        description: null,
         group: "default",
         http: {
           headers: {},
@@ -474,6 +478,7 @@ describe("ProbeStore", () => {
     const freshStore = new ProbeStore(join(tempDir, "fresh-stats.db"));
     freshStore.syncTargets([
       {
+        description: null,
         group: "default",
         http: {
           headers: {},
@@ -662,4 +667,35 @@ describe("ProbeStore", () => {
 
     pruneStore.close();
   });
+
+  test("syncTargets 持久化 description", () => {
+    const descStore = new ProbeStore(join(tempDir, "desc.db"));
+    const targetWithDesc: ResolvedHttpTarget = {
+      ...httpTarget,
+      description: "检查 API 健康状态",
+      id: "desc-test",
+      name: "desc-test",
+    };
+    descStore.syncTargets([targetWithDesc]);
+    const t = descStore.getTargets()[0]!;
+    expect(t.description).toBe("检查 API 健康状态");
+    descStore.close();
+  });
+
+  test("未配置 description 时持久化为 null", () => {
+    const noDescStore = new ProbeStore(join(tempDir, "no-desc.db"));
+    noDescStore.syncTargets([{ ...httpTarget, description: null, id: "no-desc", name: "no-desc" }]);
+    const t = noDescStore.getTargets()[0]!;
+    expect(t.description).toBeNull();
+    noDescStore.close();
+  });
+
+  test("同步更新 description", () => {
+    const updateDescStore = new ProbeStore(join(tempDir, "update-desc.db"));
+    updateDescStore.syncTargets([{ ...httpTarget, description: "旧描述", id: "update-desc", name: "update-desc" }]);
+    updateDescStore.syncTargets([{ ...httpTarget, description: "新描述", id: "update-desc", name: "update-desc" }]);
+    const t = updateDescStore.getTargets()[0]!;
+    expect(t.description).toBe("新描述");
+    updateDescStore.close();
+  });
 });