Gabung app Android Flutter 'Saat Invest' ke repo saat-app (folder flutter/)

Satu repo untuk backend Odoo (addon saat_invest) + app Android.
- flutter/ berisi project Flutter (lib/, android/, pubspec, test)
- Login Odoo JSON-RPC, tab Portofolio+Equity, tab Transaksi, catat jual/beli otomatis sync
- Build .gitignore nested dipakai sehingga artefak build/.dart_tool tak ter-track
Sejarah: gabung flat (satu sejarah backend+app).

flutter/lib/models/saham_transaksi.dart

@@ -0,0 +1,63 @@
+/// Model Saham master dari saat.saham.
+class Saham {
+  final int id;
+  final String kode;
+  final String? perusahaan;
+  final String? sektor;
+
+  Saham({required this.id, required this.kode, this.perusahaan, this.sektor});
+
+  factory Saham.fromOdoo(Map<String, dynamic> m) => Saham(
+        id: (m['id'] as num).toInt(),
+        kode: (m['name'] as String?) ?? '',
+        perusahaan: m['perusahaan'] as String?,
+        sektor: m['sector'] as String?,
+      );
+}
+
+/// Model Transaksi dari saat.transaksi.
+class Transaksi {
+  final int id;
+  final String tanggal;
+  final String tipe; // buy | sell
+  final int sahamId;
+  final String sahamTicker;
+  final int volume;
+  final double harga;
+  final double fee;
+  final double total;
+
+  Transaksi({
+    required this.id,
+    required this.tanggal,
+    required this.tipe,
+    required this.sahamId,
+    required this.sahamTicker,
+    required this.volume,
+    required this.harga,
+    required this.fee,
+    required this.total,
+  });
+
+  bool get isBuy => tipe == 'buy';
+
+  factory Transaksi.fromOdoo(Map<String, dynamic> m) {
+    String ticker = '';
+    final s = m['saham_id'];
+    if (s is List && s.isNotEmpty) {
+      ticker = s.length > 1 ? s[1].toString() : '${s[0]}';
+    }
+    final sid = s is List ? (s.first as num).toInt() : (s as num?)?.toInt() ?? 0;
+    return Transaksi(
+      id: (m['id'] as num).toInt(),
+      tanggal: (m['tanggal'] as String?) ?? '',
+      tipe: (m['tipe'] as String?) ?? 'buy',
+      sahamId: sid,
+      sahamTicker: ticker,
+      volume: (m['volume'] as num?)?.toInt() ?? 0,
+      harga: (m['harga'] as num?)?.toDouble() ?? 0,
+      fee: (m['fee'] as num?)?.toDouble() ?? 0,
+      total: (m['total'] as num?)?.toDouble() ?? 0,
+    );
+  }
+}