feat: 配置变量系统与 target id/name 双字段标识

- 新增顶层 variables 段支持 string/number/boolean 字面量
- target 字符串字段支持 、、{...} 转义语法
- 变量解析优先级: variables -> process.env -> 默认值 -> 报错
- 完整引用保留原始类型，部分引用拼接为字符串
- 变量替换在 YAML 解析后、AJV 校验前执行
- 替换仅作用于 targets，跳过 id/type 字段
- target 新增必填 id 字段作为唯一标识，name 改为可选展示名称
- 数据库存储/API/前端全面迁移到 id 标识
- 统一 checker 运行时类型检查为 es-toolkit predicates
- 同步 delta specs 到主 specs，归档 config-variables 变更

src/server/checker/runner/http/execute.ts

@@ -1,4 +1,5 @@
 import { isError } from "es-toolkit";
+import { isObject } from "es-toolkit/compat";
 
 import type { CheckResult, RawTargetConfig } from "../../types";
 import type { CheckerContext, CheckerDefinition, CheckerValidationInput, ResolveContext } from "../types";
@@ -95,7 +96,7 @@ export class HttpChecker implements CheckerDefinition<ResolvedHttpTarget> {
         ),
         matched: false,
         statusDetail: null,
-        targetName: t.name,
+        targetId: t.id,
         timestamp,
       };
     }
@@ -122,8 +123,9 @@ export class HttpChecker implements CheckerDefinition<ResolvedHttpTarget> {
         method,
         url: t.http.url,
       },
+      id: t.id,
       intervalMs: context.defaultIntervalMs,
-      name: t.name,
+      name: t.name ?? t.id,
       timeoutMs: context.defaultTimeoutMs,
       type: "http",
     } satisfies ResolvedHttpTarget;
@@ -154,10 +156,7 @@ function buildRedirectInit(init: RequestInit, statusCode: number, fromUrl: strin
   const method = init.method?.toUpperCase();
 
   if (statusCode === 303 || ((statusCode === 301 || statusCode === 302) && method === "POST")) {
-    const headers =
-      typeof init.headers === "object" && init.headers !== null
-        ? { ...(init.headers as Record<string, string>) }
-        : undefined;
+    const headers = isObject(init.headers) ? { ...(init.headers as Record<string, string>) } : undefined;
     if (headers) {
       for (const key of Object.keys(headers)) {
         const lower = key.toLowerCase();
@@ -172,7 +171,7 @@ function buildRedirectInit(init: RequestInit, statusCode: number, fromUrl: strin
   try {
     const fromOrigin = new URL(fromUrl).origin;
     const toOrigin = new URL(toUrl).origin;
-    if (fromOrigin !== toOrigin && newInit.headers && typeof newInit.headers === "object") {
+    if (fromOrigin !== toOrigin && isObject(newInit.headers)) {
       const headers = { ...(newInit.headers as Record<string, string>) };
       for (const key of Object.keys(headers)) {
         if (SENSITIVE_HEADERS.has(key.toLowerCase())) {
@@ -264,7 +263,7 @@ function makeResult(
     failure,
     matched: failure === null,
     statusDetail: `HTTP ${statusCode}`,
-    targetName: t.name,
+    targetId: t.id,
     timestamp,
   };
 }