fix: synchronize runtime locales and harden online updates

Translate UI, scheduler, validation, preload and maintenance messages dynamically, and propagate locale changes between workers. Harden update checks, downloads and terminal states, verify Debian pnpm, and ignore generated test artifacts.

test/back/upgrade-guards.test.cjs

@@ -88,7 +88,7 @@ for (const legacy of [true, false])
       try {
         await entered;
         const contender = await Promise.race(attempts);
-        assert.match(contender.error?.message || '', /Another upgrade/);
+        assert.match(contender.error?.message || '', /Another upgrade|已有更新或重载/);
         assert.equal(maximum, 1);
         assert.equal((await original.readdir(lock)).length, 1);
       } finally {
@@ -106,7 +106,7 @@ test('an empty abandoned lock is acquired atomically and a failed operation rele
     withUpgradeLock(tmp, async () => {
       await assert.rejects(
         withUpgradeLock(tmp, async () => assert.fail('concurrent operation')),
-        /Another upgrade/,
+        /Another upgrade|已有更新或重载/,
       );
       throw new Error('operation failed');
     }),
@@ -169,7 +169,7 @@ withUpgradeLock(process.argv[2], async () => {
     await withUpgradeLock(tmp, async () => {
       await assert.rejects(
         withUpgradeLock(tmp, async () => {}),
-        /Another upgrade/,
+        /Another upgrade|已有更新或重载/,
       );
     });
     assert.deepEqual(await fs.readdir(tmp), ['worker.cjs']);
@@ -235,7 +235,7 @@ test(
       res.once('close', () => clearInterval(timer));
     });
     const began = Date.now();
-    await assert.rejects(waitForHealth({ QlPort: port }, 80), /health check/);
+    await assert.rejects(waitForHealth({ QlPort: port }, 80), /health check|后端启动检查失败/);
     assert.ok(
       Date.now() - began < 1000,
       'deadline must not depend on socket inactivity',
@@ -280,6 +280,6 @@ for (const streaming of [false, true])
 test('unhealthy, malformed and oversized health responses fail within the deadline', async (t) => {
   for (const body of ['{}', '{', ' '.repeat(65537)]) {
     const port = await healthServer(t, (req, res) => res.end(body));
-    await assert.rejects(waitForHealth({ QlPort: port }, 20), /health check/);
+    await assert.rejects(waitForHealth({ QlPort: port }, 20), /health check|后端启动检查失败/);
   }
 });