refactor: 移除 success 字段，简化为 matched 单层判定模型

tests/server/app.test.ts

@@ -58,7 +58,6 @@ describe("API 路由", () => {
     store.insertCheckResult({
       targetId: targets[0]!.id,
       timestamp: "2025-01-01T00:00:00.000Z",
-      success: true,
       matched: true,
       durationMs: 150,
       statusDetail: "200 OK",
@@ -67,7 +66,6 @@ describe("API 路由", () => {
     store.insertCheckResult({
       targetId: targets[0]!.id,
       timestamp: "2025-01-01T00:00:30.000Z",
-      success: false,
       matched: false,
       durationMs: null,
       statusDetail: null,
@@ -121,7 +119,6 @@ describe("API 路由", () => {
     expect(tA.target).toBe("http://a.com");
     expect(tA.group).toBe("default");
     expect(tA.latestCheck).not.toBeNull();
-    expect(tA.latestCheck!.success).toBe(false);
     expect(tA.latestCheck!.matched).toBe(false);
     expect(tA.latestCheck!.failure).not.toBeNull();
     expect(tA.recentSamples).toBeDefined();