feat: 将 demo 项目转化为 HTTP 拨测监控工具

新增 YAML 配置解析（Bun 内置 YAML）、SQLite 数据存储（bun:sqlite）、按 interval 分组并发拨测引擎、REST API（/api/summary、/api/targets、/api/targets/:id/history、/api/targets/:id/trend）、React 前端 Dashboard（统计卡片、目标表格、可展开详情面板、recharts 趋势图）。CLI 简化为仅接受配置文件路径。移除 /api/demo 路由和相关 demo 代码。保留 /health、静态资源服务和 SPA fallback。

tests/server/checker/fetcher.test.ts

@@ -0,0 +1,45 @@
+import { describe, expect, test } from "bun:test";
+import { checkExpect } from "../../../src/server/checker/fetcher";
+
+describe("checkExpect", () => {
+  test("无 expect 配置时 matched 为 true", () => {
+    expect(checkExpect(200, "ok", 100, undefined)).toBe(true);
+  });
+
+  test("status 匹配", () => {
+    expect(checkExpect(200, "", 100, { status: [200, 201] })).toBe(true);
+    expect(checkExpect(201, "", 100, { status: [200, 201] })).toBe(true);
+    expect(checkExpect(404, "", 100, { status: [200, 201] })).toBe(false);
+  });
+
+  test("bodyContains 匹配", () => {
+    expect(checkExpect(200, "hello world", 100, { bodyContains: "hello" })).toBe(true);
+    expect(checkExpect(200, "hello world", 100, { bodyContains: "missing" })).toBe(false);
+  });
+
+  test("maxLatencyMs 匹配", () => {
+    expect(checkExpect(200, "", 100, { maxLatencyMs: 200 })).toBe(true);
+    expect(checkExpect(200, "", 300, { maxLatencyMs: 200 })).toBe(false);
+    expect(checkExpect(200, "", 200, { maxLatencyMs: 200 })).toBe(true);
+  });
+
+  test("多条 expect 全部通过", () => {
+    expect(
+      checkExpect(200, "healthy", 100, {
+        status: [200],
+        bodyContains: "healthy",
+        maxLatencyMs: 200,
+      }),
+    ).toBe(true);
+  });
+
+  test("多条 expect 部分失败", () => {
+    expect(
+      checkExpect(200, "healthy", 500, {
+        status: [200],
+        bodyContains: "healthy",
+        maxLatencyMs: 200,
+      }),
+    ).toBe(false);
+  });
+});