fix(auto-pause): auto-resume on a listener's return via clientEnter event

Follow-up to the auto-pause fix: resume never fired when someone came back.

Root cause (verified live against a TS3 server): the full-client library's
command/response channel is dead whenever >=2 clients are connected anywhere on
the server — clientlist, channellist and channelclientlist ALL time out
(confirmed even with the two clients in different channels). So the moment a
listener returns is exactly the moment occupancy can no longer be queried, and
the query-based refreshOccupancy() can never observe the return -> no resume.
Event channelID is also unusable (library reads notify `cid` but enter-view
carries `ctid`, so it's always 0), so per-channel membership can't be derived
from events either.

Fix (minimal, asymmetric): keep PAUSE on the authoritative clientlist path
(reliable precisely because it only succeeds when the bot is alone on the
server — the only state pause should fire), and arm RESUME directly from the
clientEnter push event. Because the bot only auto-pauses while alone, the sole
way occupancy can return while autoPaused is set is a fresh connection, which
arrives reliably as clientEnter. New pure predicate shouldResumeOnReturn() +
_resumeIfReturning() resume iff autoPaused && paused; the resume branch routes
through handleOccupancy(1) and NEVER pauses (userCount>0), so a spurious enter
can only harmlessly resume. The bot's own enter at connect is a no-op
(autoPaused is already false).

This deliberately does NOT adopt a full event-tracked peer set: events don't
reliably seed clients already present when the bot joins, so a count-from-events
==0 would reintroduce the false-pause bug we just fixed, and reconcile can't
heal it (clientlist only works when alone). Pause must trust only the
authoritative query; resume can trust the event.

Net semantics: pause when the server is empty (bot alone), resume when someone
connects. Channel granularity is impossible with this library. UI copy updated
to say "服务器" instead of "频道", and the Settings toggle default corrected to
false to match the backend default. cmdVote intentionally left as-is.

Verified live: auto-paused bot + a real client connecting -> resume fires with
no clientlist call in the path; bot's own enter and not-auto-paused enters do
not resume. 311 unit tests pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/src/views/Settings.vue

@@ -417,7 +417,7 @@
           <Icon icon="mdi:timer-off-outline" class="setting-icon" />
           <div>
             <div>闲置自动退出</div>
-            <div style="font-size:12px; opacity:0.6; margin-top:2px">频道无人时，机器人自动断开的等待时间（0 = 不退出）</div>
+            <div style="font-size:12px; opacity:0.6; margin-top:2px">服务器上没有其他人时，机器人自动断开的等待时间（0 = 不退出）</div>
           </div>
         </div>
         <div class="prefix-input-wrap">
@@ -435,8 +435,8 @@
       </div>
       <label class="profile-toggle behavior-toggle">
         <div class="profile-toggle-text">
-          <div class="profile-toggle-label">频道无人时自动暂停播放</div>
-          <div class="profile-toggle-hint">机器人所在频道没有其他人时自动暂停，有人加入后可继续播放</div>
+          <div class="profile-toggle-label">无人时自动暂停播放</div>
+          <div class="profile-toggle-hint">服务器上只剩机器人自己时自动暂停，有人连接后自动继续播放（受协议限制，占用判断以整个服务器为准，无法精确到单个频道）</div>
         </div>
         <input
           v-model="autoPauseOnEmpty"
@@ -955,13 +955,14 @@ async function savePrefix() {
 
 // Idle timeout
 const idleTimeout = ref(0);
-const autoPauseOnEmpty = ref(true);
+// Defaults OFF to match the backend default (config.ts getDefaultConfig).
+const autoPauseOnEmpty = ref(false);
 
 async function loadIdleTimeout() {
   try {
     const res = await axios.get('/api/bot/settings');
     idleTimeout.value = res.data.idleTimeoutMinutes ?? 0;
-    autoPauseOnEmpty.value = res.data.autoPauseOnEmpty ?? true;
+    autoPauseOnEmpty.value = res.data.autoPauseOnEmpty ?? false;
   } catch { /* ignore */ }
 }