feat(lms): add Docker setup guidance and improve remote workspace handling

src/main/dockerStatus.ts

@@ -0,0 +1,27 @@
+import { execFile } from 'node:child_process'
+
+export type DockerStatus = 'ready' | 'missing' | 'permission' | 'unavailable' | 'error'
+
+export function classifyDockerError(code: string | number | null | undefined, message: string): DockerStatus {
+  if (code === 'ENOENT') return 'missing'
+  if (/permission denied|access is denied|EACCES/i.test(message)) return 'permission'
+  if (/cannot connect|connection refused|is the docker daemon running/i.test(message)) return 'unavailable'
+  return 'error'
+}
+
+export function checkDockerStatus(): Promise<{ status: DockerStatus; platform: string }> {
+  return new Promise((resolve) => {
+    execFile('docker', ['info', '--format', '{{.ServerVersion}}'], {
+      timeout: 5000,
+      maxBuffer: 256 * 1024,
+      env: { ...process.env, LC_ALL: 'C', LANG: 'C' },
+    }, (error, stdout, stderr) => {
+      resolve({
+        status: error
+          ? classifyDockerError(error.code, `${error.message}\n${stderr}`)
+          : stdout.trim() ? 'ready' : 'error',
+        platform: process.platform,
+      })
+    })
+  })
+}