refactor: 重命名 command checker 为 cmd checker 并适配跨平台测试

将 type/configKey 从 "command" 统一为 "cmd"，源码目录 runner/command/ → runner/cmd/，
spec 目录 command-checker/ → cmd-checker/，测试全部改用 bun -e 替代 Unix 系统命令，
归档 cmd-checker-enhancement 变更并同步 delta spec 到主 spec。

tests/server/checker/engine.test.ts

@@ -1,15 +1,19 @@
 import { describe, expect, test } from "bun:test";
 
-import type { ResolvedCommandTarget } from "../../../src/server/checker/runner/command/types";
+import type { ResolvedCommandTarget } from "../../../src/server/checker/runner/cmd/types";
 import type { ResolvedHttpTarget } from "../../../src/server/checker/runner/http/types";
 import type { ProbeStore } from "../../../src/server/checker/store";
 import type { ResolvedTargetBase } from "../../../src/server/checker/types";
 
 import { ProbeEngine } from "../../../src/server/checker/engine";
 import { checkerRegistry } from "../../../src/server/checker/runner";
-import { CommandChecker } from "../../../src/server/checker/runner/command/execute";
+import { CommandChecker } from "../../../src/server/checker/runner/cmd/execute";
 import { HttpChecker } from "../../../src/server/checker/runner/http/execute";
 
+const processEnv = Object.fromEntries(
+  Object.entries(process.env).filter((entry): entry is [string, string] => entry[1] !== undefined),
+);
+
 function createMockStore(targetNames: string[]) {
   let nextId = 1;
   const targets = targetNames.map((name) => ({ id: nextId++, name }));
@@ -27,7 +31,7 @@ function createMockStore(targetNames: string[]) {
         name,
         target: "",
         timeout_ms: 5000,
-        type: "command" as const,
+        type: "cmd" as const,
       }));
     },
     insertCheckResult(result: Record<string, unknown>) {
@@ -45,18 +49,18 @@ function ensureRegistered() {
 
 function makeCommandTarget(name: string, overrides?: Partial<ResolvedCommandTarget>): ResolvedCommandTarget {
   return {
-    command: {
-      args: ["hello"],
-      cwd: "/tmp",
-      env: {},
-      exec: "echo",
+    cmd: {
+      args: ["-e", "console.log('hello')"],
+      cwd: process.cwd(),
+      env: processEnv,
+      exec: "bun",
       maxOutputBytes: 1024 * 1024,
     },
     group: "default",
     intervalMs: 60000,
     name,
     timeoutMs: 5000,
-    type: "command",
+    type: "cmd",
     ...overrides,
   };
 }
@@ -72,7 +76,7 @@ describe("ProbeEngine", () => {
     expect(true).toBe(true);
   });
 
-  test("单次 probeGroup 执行 command 检查", async () => {
+  test("单次 probeGroup 执行 cmd 检查", async () => {
     const target = makeCommandTarget("cmd-echo");
     const mockStore = createMockStore(["cmd-echo"]) as unknown as ProbeStore;
     const engine = new ProbeEngine(mockStore, [target]);
@@ -90,10 +94,22 @@ describe("ProbeEngine", () => {
 
   test("多个目标并发执行", async () => {
     const targetA = makeCommandTarget("echo-a", {
-      command: { args: ["a"], cwd: "/tmp", env: {}, exec: "echo", maxOutputBytes: 1024 * 1024 },
+      cmd: {
+        args: ["-e", "console.log('a')"],
+        cwd: process.cwd(),
+        env: processEnv,
+        exec: "bun",
+        maxOutputBytes: 1024 * 1024,
+      },
     });
     const targetB = makeCommandTarget("echo-b", {
-      command: { args: ["b"], cwd: "/tmp", env: {}, exec: "echo", maxOutputBytes: 1024 * 1024 },
+      cmd: {
+        args: ["-e", "console.log('b')"],
+        cwd: process.cwd(),
+        env: processEnv,
+        exec: "bun",
+        maxOutputBytes: 1024 * 1024,
+      },
     });
 
     const mockStore = createMockStore(["echo-a", "echo-b"]) as unknown as ProbeStore;
@@ -110,7 +126,13 @@ describe("ProbeEngine", () => {
 
   test("失败目标不阻塞其他目标", async () => {
     const badTarget = makeCommandTarget("bad-cmd", {
-      command: { args: [], cwd: "/tmp", env: {}, exec: "false", maxOutputBytes: 1024 * 1024 },
+      cmd: {
+        args: ["-e", "process.exit(1)"],
+        cwd: process.cwd(),
+        env: processEnv,
+        exec: "bun",
+        maxOutputBytes: 1024 * 1024,
+      },
     });
     const goodTarget = makeCommandTarget("good-cmd");
 
@@ -133,7 +155,7 @@ describe("ProbeEngine", () => {
 
   test("checker rejected 时写入 internal error 结果", async () => {
     ensureRegistered();
-    const checker = checkerRegistry.get("command");
+    const checker = checkerRegistry.get("cmd");
     const originalExecute = checker.execute.bind(checker);
     checker.execute = async (target, ctx) => {
       if (target.name === "reject-cmd") {
@@ -176,7 +198,13 @@ describe("ProbeEngine", () => {
   test("并发限制 maxConcurrentChecks", async () => {
     const targets = Array.from({ length: 5 }, (_, i) =>
       makeCommandTarget(`cmd-${i}`, {
-        command: { args: [String(i)], cwd: "/tmp", env: {}, exec: "echo", maxOutputBytes: 1024 * 1024 },
+        cmd: {
+          args: ["-e", `console.log('${i}')`],
+          cwd: process.cwd(),
+          env: processEnv,
+          exec: "bun",
+          maxOutputBytes: 1024 * 1024,
+        },
       }),
     );