feat(sync): import Takeout HTML/CSV (historique, WL, abos) sans API

server/index.mjs

@@ -357,6 +357,39 @@ r.post('/subscriptions', authMiddlewareCookieAware, subscriptionsLimiter, async
   }
 });
 
+// Import en lot (ex. abonnements.csv de Takeout) : upsert direct, sans
+// résolution externe (les IDs Takeout sont déjà fiables).
+r.post('/subscriptions/batch', authMiddlewareCookieAware, subscriptionsLimiter, (req, res) => {
+  try {
+    const items = Array.isArray(req.body?.items) ? req.body.items : [];
+    if (!items.length) return res.status(400).json({ error: 'items_required' });
+    if (items.length > 1000) return res.status(400).json({ error: 'batch_too_large' });
+    const allowed = new Set(['youtube', 'twitch', 'dailymotion', 'peertube', 'odysee', 'rumble', 'yt', 'dm', 'tw', 'pt', 'od', 'ru']);
+    let imported = 0;
+    let skipped = 0;
+    for (const it of items) {
+      const provider = String(it?.provider || 'youtube').trim().toLowerCase();
+      const externalId = String(it?.externalId || '').trim().slice(0, 128);
+      if (!allowed.has(provider) || !externalId) { skipped++; continue; }
+      try {
+        const row = upsertChannelRow({
+          provider, externalId,
+          title: String(it?.title || externalId).slice(0, 200) || null,
+          handle: String(it?.handle || '').slice(0, 128) || null,
+          avatarUrl: String(it?.avatarUrl || '').slice(0, 500) || null,
+          url: String(it?.url || '').slice(0, 500) || null,
+          lastRefreshedAt: Date.now(),
+        });
+        subscribeChannel({ userId: req.user.id, provider, externalId, channelId: row?.id });
+        imported++;
+      } catch { skipped++; }
+    }
+    return res.json({ imported, skipped, total: items.length });
+  } catch {
+    return res.status(500).json({ error: 'subscriptions_batch_failed' });
+  }
+});
+
 r.delete('/subscriptions/:subscriptionId', authMiddlewareCookieAware, subscriptionsLimiter, (req, res) => {
   try {
     const info = unsubscribeChannel({ userId: req.user.id, subscriptionId: req.params.subscriptionId });