Add runtime version reporting and display

test/server/state-contract.test.js

@@ -103,6 +103,10 @@ test('GET and domain mutations return one state shape with monotonic revisions',
   const singboxPath = path.join(binDir, 'sing-box');
   const workingSingbox = `#!/usr/bin/env node
 if (process.argv[2] === 'check') process.exit(0);
+if (process.argv[2] === 'version') {
+  console.log('sing-box version 1.12.13');
+  process.exit(0);
+}
 process.on('SIGTERM', () => process.exit(0));
 setInterval(() => {}, 60_000);
 `;
@@ -155,6 +159,13 @@ setInterval(() => {}, 60_000);
   });
 
   const initial = await waitForState(port, child, () => stderr);
+  const version = await request(port, '/api/version');
+  assert.deepEqual(version, {
+    apiVersion: 1,
+    location: 'mac',
+    components: { macClient: '0.1.0' },
+    runtime: { singBox: '1.12.13' },
+  });
   assertStateSnapshot(initial);
   assert.equal(initial.selection.appliedServerId, 'test-vpn');
   assert.equal(JSON.stringify(initial).includes(subscriptionUrl), false);