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/services/stock_service.dart

@@ -0,0 +1,83 @@
+import '../api/odoo_client.dart';
+import '../models/portfolio.dart';
+import '../models/saham_transaksi.dart';
+
+/// Layanan domain utk model Odoo saat_invest.
+class StockService {
+  StockService(this.client);
+
+  final OdooClient client;
+
+  // ---- Saham ----
+  Future<List<Saham>> listSaham() async {
+    final res = await client.executeKwd(
+      'saat.saham',
+      'search_read',
+      args: [
+        [],
+        {'fields': ['name', 'perusahaan', 'sector']},
+      ],
+    );
+    return (res as List).map((e) => Saham.fromOdoo(e as Map<String, dynamic>)).toList();
+  }
+
+  // ---- Portofolio ----
+  Future<List<Portfolio>> listPortofolio() async {
+    final res = await client.executeKwd(
+      'saat.portofolio',
+      'search_read',
+      args: [
+        [],
+        {
+          'fields': [
+            'saham_id', 'sisa_lembar', 'avg_cost', 'harga_sekarang',
+            'nilai_sekarang', 'realized_pl', 'unrealized_pl',
+          ]
+        },
+      ],
+    );
+    return (res as List).map((e) => Portfolio.fromOdoo(e as Map<String, dynamic>)).toList();
+  }
+
+  // ---- Transaksi ----
+  Future<List<Transaksi>> listTransaksi() async {
+    final res = await client.executeKwd(
+      'saat.transaksi',
+      'search_read',
+      args: [
+        [],
+        {
+          'fields': [
+            'tanggal', 'tipe', 'saham_id', 'volume', 'harga', 'fee', 'total'
+          ],
+          'order': 'tanggal desc, id desc',
+        },
+      ],
+    );
+    return (res as List).map((e) => Transaksi.fromOdoo(e as Map<String, dynamic>)).toList();
+  }
+
+  Future<int> addTransaksi({
+    required int sahamId,
+    required String tipe, // buy | sell
+    required int volume,
+    required double harga,
+    required double fee,
+    String? tanggal, // 'YYYY-MM-DD'
+  }) async {
+    final vals = <String, dynamic>{
+      'saham_id': sahamId,
+      'tipe': tipe,
+      'volume': volume,
+      'harga': harga,
+      'fee': fee,
+      if (tanggal != null) 'tanggal': tanggal,
+    };
+    final res = await client.executeKwd('saat.transaksi', 'create', args: [vals]);
+    return (res as num).toInt();
+  }
+
+  Future<void> hapusTransaksi(List<int> ids) async {
+    await client.executeKwd('saat.transaksi', 'unlink', args: [ids]);
+  }
+}