feat(config): add live slow-sql threshold setting

admin-frontend/src/pages/SystemPage.vue

@@ -11,6 +11,7 @@ const loading = ref(false)
 const maxConcurrentGlobal = ref(2)
 const maxConcurrentPerAccount = ref(1)
 const maxScreenshotConcurrent = ref(3)
+const dbSlowQueryMs = ref(120)
 
 const proxyEnabled = ref(false)
 const proxyApiUrl = ref('')
@@ -67,6 +68,7 @@ async function loadAll() {
     maxConcurrentGlobal.value = system.max_concurrent_global ?? 2
     maxConcurrentPerAccount.value = system.max_concurrent_per_account ?? 1
     maxScreenshotConcurrent.value = system.max_screenshot_concurrent ?? 3
+    dbSlowQueryMs.value = system.db_slow_query_ms ?? 120
 
     autoApproveEnabled.value = (system.auto_approve_enabled ?? 0) === 1
     autoApproveHourlyLimit.value = system.auto_approve_hourly_limit ?? 10
@@ -100,11 +102,12 @@ async function saveConcurrency() {
     max_concurrent_global: Number(maxConcurrentGlobal.value),
     max_concurrent_per_account: Number(maxConcurrentPerAccount.value),
     max_screenshot_concurrent: Number(maxScreenshotConcurrent.value),
+    db_slow_query_ms: Number(dbSlowQueryMs.value),
   }
 
   try {
     await ElMessageBox.confirm(
-      `确定更新并发配置吗？\n\n全局并发数: ${payload.max_concurrent_global}\n单账号并发数: ${payload.max_concurrent_per_account}\n截图并发数: ${payload.max_screenshot_concurrent}`,
+      `确定更新并发配置吗？\n\n全局并发数: ${payload.max_concurrent_global}\n单账号并发数: ${payload.max_concurrent_per_account}\n截图并发数: ${payload.max_screenshot_concurrent}\n慢 SQL 阈值: ${payload.db_slow_query_ms}ms`,
       '保存并发配置',
       { confirmButtonText: '保存', cancelButtonText: '取消', type: 'warning' },
     )
@@ -337,6 +340,11 @@ onMounted(loadAll)
             <el-input-number v-model="maxScreenshotConcurrent" :min="1" :max="50" />
             <div class="help">截图资源占用较低，可按机器性能逐步提高。</div>
           </el-form-item>
+
+          <el-form-item label="慢 SQL 阈值(ms)">
+            <el-input-number v-model="dbSlowQueryMs" :min="0" :max="60000" />
+            <div class="help">低于该阈值不会计入慢 SQL（0 表示关闭慢 SQL 采样）。</div>
+          </el-form-item>
         </el-form>
 
         <div class="row-actions">