✨ feat(models-sync): official upstream sync with conflict resolution UI, opt‑out flag, and backend resiliency

Backend
- Add endpoints:
  - GET /api/models/sync_upstream/preview — diff preview (filters out models with sync_official = 0)
  - POST /api/models/sync_upstream — apply sync (create missing; optionally overwrite selected fields)
- Respect opt‑out: skip models with sync_official = 0 in both preview and apply
- Return detailed stats: created_models, created_vendors, updated_models, skipped_models, plus created_list / updated_list
- Add model.Model.SyncOfficial (default 1); auto‑migrated by GORM
- Make HTTP fetching robust:
  - Shared http.Client (connection reuse) with 3x exponential backoff retry
  - 10MB response cap; keep existing IPv4‑first for *.github.io
- Vendor handling:
  - New ensureVendorID helper (cache lookup → DB lookup → create), reduces round‑trips
  - Transactional overwrite to avoid partial updates
- Small cleanups and clearer helpers (containsField, coalesce, chooseStatus)

Frontend
- ModelsActions: add “Sync official” button with Popover (p‑2) explaining community contribution; loading = syncing || previewing; preview → conflict modal → apply flow
- New UpstreamConflictModal:
  - Per‑field columns (description/icon/tags/vendor/name_rule/status) with column‑level checkbox to select all
  - Cell with Checkbox + Tag (“Click to view differences”) and Popover (p‑2) showing Local vs Official values
  - Auto‑hide columns with no conflicts; responsive width; use native Semi Modal footer
  - Full i18n coverage
- useModelsData: add syncing/previewing states; new methods previewUpstreamDiff, applyUpstreamOverwrite, syncUpstream; refresh vendors/models after apply
- EditModelModal: add “Participate in official sync” switch; persisted as sync_official
- ModelsColumnDefs: add “Participate in official sync” column

i18n
- Add missing English keys for the new UI and messages; fix quoting issues

Refs
- Upstream metadata: https://github.com/basellm/llm-metadata

web/src/components/table/models/ModelsActions.jsx

@@ -21,10 +21,11 @@ import React, { useState } from 'react';
 import MissingModelsModal from './modals/MissingModelsModal';
 import PrefillGroupManagement from './modals/PrefillGroupManagement';
 import EditPrefillGroupModal from './modals/EditPrefillGroupModal';
-import { Button, Modal } from '@douyinfe/semi-ui';
+import { Button, Modal, Popover } from '@douyinfe/semi-ui';
 import { showSuccess, showError, copy } from '../../../helpers';
 import CompactModeToggle from '../../common/ui/CompactModeToggle';
 import SelectionNotification from './components/SelectionNotification';
+import UpstreamConflictModal from './modals/UpstreamConflictModal';
 
 const ModelsActions = ({
   selectedKeys,
@@ -32,6 +33,11 @@ const ModelsActions = ({
   setEditingModel,
   setShowEdit,
   batchDeleteModels,
+  syncing,
+  previewing,
+  syncUpstream,
+  previewUpstreamDiff,
+  applyUpstreamOverwrite,
   compactMode,
   setCompactMode,
   t,
@@ -42,6 +48,21 @@ const ModelsActions = ({
   const [showGroupManagement, setShowGroupManagement] = useState(false);
   const [showAddPrefill, setShowAddPrefill] = useState(false);
   const [prefillInit, setPrefillInit] = useState({ id: undefined });
+  const [showConflict, setShowConflict] = useState(false);
+  const [conflicts, setConflicts] = useState([]);
+
+  const handleSyncUpstream = async () => {
+    // 先预览
+    const data = await previewUpstreamDiff?.();
+    const conflictItems = data?.conflicts || [];
+    if (conflictItems.length > 0) {
+      setConflicts(conflictItems);
+      setShowConflict(true);
+      return;
+    }
+    // 无冲突，直接同步缺失
+    await syncUpstream?.();
+  };
 
   // Handle delete selected models with confirmation
   const handleDeleteSelectedModels = () => {
@@ -104,6 +125,38 @@ const ModelsActions = ({
           {t('未配置模型')}
         </Button>
 
+        <Popover
+          position='bottom'
+          trigger='hover'
+          content={
+            <div className='p-2 max-w-[360px]'>
+              <div className='text-[var(--semi-color-text-2)] text-sm'>
+                {t(
+                  '模型社区需要大家的共同维护，如发现数据有误或想贡献新的模型数据，请访问：',
+                )}
+              </div>
+              <a
+                href='https://github.com/basellm/llm-metadata'
+                target='_blank'
+                rel='noreferrer'
+                className='text-blue-600 underline'
+              >
+                https://github.com/basellm/llm-metadata
+              </a>
+            </div>
+          }
+        >
+          <Button
+            type='secondary'
+            className='flex-1 md:flex-initial'
+            size='small'
+            loading={syncing || previewing}
+            onClick={handleSyncUpstream}
+          >
+            {t('同步官方')}
+          </Button>
+        </Popover>
+
         <Button
           type='secondary'
           className='flex-1 md:flex-initial'
@@ -165,6 +218,17 @@ const ModelsActions = ({
         editingGroup={prefillInit}
         onSuccess={() => setShowAddPrefill(false)}
       />
+
+      <UpstreamConflictModal
+        visible={showConflict}
+        onClose={() => setShowConflict(false)}
+        conflicts={conflicts}
+        onSubmit={async (payload) => {
+          return await applyUpstreamOverwrite?.(payload);
+        }}
+        t={t}
+        loading={syncing}
+      />
     </>
   );
 };