fix: add DELETE and batch PUT endpoints for decks

backend/src/lib/handlers/cards.ts

@@ -40,3 +40,28 @@ route('player/:steamId/decks/:index', ['PUT'], (ctx: HandlerContext) => {
   `).run(ctx.params.steamId, idx, name || 'My Deck', JSON.stringify(cards || []), name || 'My Deck', JSON.stringify(cards || []));
   return { success: true };
 });
+
+route('player/:steamId/decks/:index', ['DELETE'], (ctx: HandlerContext) => {
+  const db = getDb();
+  const idx = parseInt(ctx.params.index);
+  db.prepare('DELETE FROM decks WHERE steam_id = ? AND deck_index = ?').run(ctx.params.steamId, idx);
+  return { success: true };
+});
+
+route('player/:steamId/decks', ['PUT'], (ctx: HandlerContext) => {
+  const { decks: decksToSave } = ctx.body as any;
+  if (!decksToSave) throw new HttpError(400, 'decks required');
+  const db = getDb();
+  const upsert = db.prepare(`
+    INSERT INTO decks (steam_id, deck_index, name, cards, updated_at) VALUES (?, ?, ?, ?, datetime('now'))
+    ON CONFLICT(steam_id, deck_index) DO UPDATE SET name = ?, cards = ?, updated_at = datetime('now')
+  `);
+  const tx = db.transaction(() => {
+    for (const [indexStr, deck] of Object.entries(decksToSave)) {
+      const d = deck as any;
+      upsert.run(ctx.params.steamId, parseInt(indexStr), d.name || 'My Deck', JSON.stringify(d.cards || []), d.name || 'My Deck', JSON.stringify(d.cards || []));
+    }
+  });
+  tx();
+  return { success: true };
+});