Add interactive SSH portfolio features

test/config.test.js

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+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { validateConfig } from '../src/config.js';
+
+const valid = () => ({
+  theme: { primary: 'cyan', accent: 'yellow', muted: 'brightBlack' },
+  host: { port: 2222, notificationPort: 7777, hostKeyPath: 'data/host.key' },
+  adminPublicKeys: []
+});
+
+test('accepts a valid configuration', () => assert.equal(validateConfig(valid()).host.port, 2222));
+test('rejects invalid ports with an actionable path', () => {
+  const config = valid(); config.host.port = 70000;
+  assert.throws(() => validateConfig(config), /host\.port/);
+});
+test('rejects unknown colors with an actionable path', () => {
+  const config = valid(); config.theme.primary = 'orange';
+  assert.throws(() => validateConfig(config), /theme\.primary/);
+});
+test('accepts key blobs and OpenSSH public-key lines', () => {
+  const config = valid(); config.adminPublicKeys = ['QUJDRA==', 'ssh-ed25519 QUJDRA== owner'];
+  assert.doesNotThrow(() => validateConfig(config));
+});