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。

src/server/checker/config-loader.ts

@@ -0,0 +1,104 @@
+import type { ProbeConfig, ResolvedTarget } from "./types";
+
+const DEFAULT_HOST = "127.0.0.1";
+const DEFAULT_PORT = 3000;
+const DEFAULT_DATA_DIR = "./data";
+const DEFAULT_INTERVAL = "30s";
+const DEFAULT_TIMEOUT = "10s";
+const DEFAULT_METHOD = "GET";
+
+export interface ResolvedConfig {
+  host: string;
+  port: number;
+  dataDir: string;
+  targets: ResolvedTarget[];
+}
+
+export async function loadConfig(configPath: string): Promise<ResolvedConfig> {
+  const file = Bun.file(configPath);
+
+  if (!(await file.exists())) {
+    throw new Error(`配置文件不存在: ${configPath}`);
+  }
+
+  const content = await file.text();
+  const raw = Bun.YAML.parse(content) as ProbeConfig | null;
+
+  if (!raw) {
+    throw new Error("配置文件内容为空或格式无效");
+  }
+
+  validateConfig(raw);
+
+  const server = raw.server ?? {};
+  const defaults = raw.defaults ?? {};
+
+  const host = server.host ?? DEFAULT_HOST;
+  const port = server.port ?? DEFAULT_PORT;
+  const dataDir = server.dataDir ?? DEFAULT_DATA_DIR;
+
+  if (!Number.isInteger(port) || port < 0 || port > 65535) {
+    throw new Error(`无效端口号: ${port}，需要 0-65535 之间的整数`);
+  }
+
+  const defaultIntervalMs = parseDuration(defaults.interval ?? DEFAULT_INTERVAL);
+  const defaultTimeoutMs = parseDuration(defaults.timeout ?? DEFAULT_TIMEOUT);
+  const defaultMethod = defaults.method ?? DEFAULT_METHOD;
+  const defaultHeaders = defaults.headers ?? {};
+
+  const targets: ResolvedTarget[] = raw.targets.map((target) => ({
+    name: target.name,
+    url: target.url,
+    method: target.method ?? defaultMethod,
+    headers: { ...defaultHeaders, ...(target.headers ?? {}) },
+    body: target.body,
+    intervalMs: parseDuration(target.interval ?? defaults.interval ?? DEFAULT_INTERVAL),
+    timeoutMs: parseDuration(target.timeout ?? defaults.timeout ?? DEFAULT_TIMEOUT),
+    expect: target.expect,
+  }));
+
+  return { host, port, dataDir, targets };
+}
+
+function validateConfig(config: ProbeConfig): void {
+  if (!config.targets || !Array.isArray(config.targets) || config.targets.length === 0) {
+    throw new Error("配置文件必须包含至少一个 target");
+  }
+
+  const names = new Set<string>();
+
+  for (let i = 0; i < config.targets.length; i++) {
+    const target = config.targets[i]!;
+
+    if (!target.name || typeof target.name !== "string" || target.name.trim() === "") {
+      throw new Error(`第 ${i + 1} 个 target 缺少 name 字段`);
+    }
+
+    if (!target.url || typeof target.url !== "string" || target.url.trim() === "") {
+      throw new Error(`target "${target.name}" 缺少 url 字段`);
+    }
+
+    if (names.has(target.name)) {
+      throw new Error(`target name 重复: "${target.name}"`);
+    }
+
+    names.add(target.name);
+  }
+}
+
+const DURATION_REGEX = /^(\d+(?:\.\d+)?)(ms|s|m)$/;
+
+export function parseDuration(value: string): number {
+  const match = DURATION_REGEX.exec(value);
+
+  if (!match) {
+    throw new Error(`无效的时长格式: "${value}"，支持格式如 "30s"、"5m"、"500ms"`);
+  }
+
+  const num = parseFloat(match[1]!);
+  const unit = match[2]!;
+
+  if (unit === "ms") return num;
+  if (unit === "s") return num * 1000;
+  return num * 60 * 1000;
+}