feat: add world voxel snapshot forwarding

Collect chunk voxel data from the bot world and stream snapshot,
chunk, and unwatch messages through the forward protocol.

tests/bot_lifecycle.test.mjs

@@ -678,3 +678,26 @@ test('context disposal reports offline once even when no instance was created',
         assert.equal(await context.connect(), 467);
     }
 });
+
+test('throwing log observers cannot interrupt socketClosed cleanup or offline reporting', async () => {
+    const {context, bots, statuses, managers, functions, timers} = setup();
+    await context.connect();
+    bots[0].emit('initialLogin');
+    const written = [];
+    context.logger.log = segments => written.push(...segments);
+    context.on('log', () => { throw new Error('log observer failed'); });
+    let lost = 0;
+    context.on('connection_lost', () => lost++);
+    assert.doesNotThrow(() => bots[0].emit('end', 'socketClosed'));
+    await flush();
+    assert.equal(context.bot_instance, null);
+    assert.equal(context.bot_status, 'offline');
+    assert.deepEqual(statuses.slice(-2), ['disconnecting', 'offline']);
+    assert.ok(written.includes('连接已断开: socketClosed'));
+    assert.ok(written.includes('[NODE] 机器人实例已关闭'));
+    assert.equal(managers[0].disposed, true);
+    assert.equal(functions[0].disposed, true);
+    assert.equal(lost, 1);
+    assert.equal(timers.size, 0);
+    await context.clear_this_context();
+});