T4: Repository pattern — ModelRepository, JsonFileRepository, ExcelRepository

- application/repositories/model_repository.py: ModelRepository Protocol
  with load(path) and save(model, path)
- infrastructure/repositories/json_file_repository.py: JsonFileRepository
  (вынесен из FinancialModel.save/load)
- infrastructure/repositories/excel_repository.py: ExcelRepository
  (бывший ExcelSync, переименован)
- FinancialModel.save/load удалены — теперь только данные
- infrastructure/sync/ удалён (ExcelSync перенесён в repositories/)
- infrastructure/cli/main.py и config.py используют JsonFileRepository +
  ExcelRepository через локальные singletons
- test_excel_sync.py переименован в test для ExcelRepository
- Новый test_repositories.py: 5 тестов для JsonFileRepository + протокол
- test_model.py: использован JsonFileRepository

Tests: 68/68 pass (было 63 + 5 новых).

tests/test_model.py

@@ -1,3 +1,4 @@
+from decimal import Decimal
 from pathlib import Path
 
 from domain import (
@@ -10,17 +11,21 @@ from domain import (
     RecurringCashflow,
     Transaction,
 )
+from infrastructure.repositories import JsonFileRepository
+
+
+_repo = JsonFileRepository()
 
 
 class TestAccount:
     def test_create(self):
-        a = Account(name="Test", balance=100.0)
+        a = Account(name="Test", balance=Decimal("100.0"))
         assert a.name == "Test"
-        assert a.balance == 100.0
+        assert a.balance == Decimal("100.0")
         assert a.currency == "USD"
 
     def test_to_dict_roundtrip(self):
-        a = Account(name="Test", balance=100.0)
+        a = Account(name="Test", balance=Decimal("100.0"))
         d = a.model_dump(mode="json")
         a2 = Account.model_validate(d)
         assert a2.name == a.name
@@ -30,11 +35,11 @@ class TestAccount:
 
 class TestTransaction:
     def test_create(self):
-        t = Transaction(amount=500.0, category="food")
-        assert t.amount == 500.0
+        t = Transaction(amount=Decimal("500.0"), category="food")
+        assert t.amount == Decimal("500.0")
 
     def test_roundtrip(self):
-        t = Transaction(amount=-100.0, category="rent", description="test")
+        t = Transaction(amount=Decimal("-100.0"), category="rent", description="test")
         d = t.model_dump(mode="json")
         t2 = Transaction.model_validate(d)
         assert t2.amount == t.amount
@@ -50,8 +55,8 @@ class TestFinancialModel:
     def test_base_currency_roundtrip(self, tmp_path: Path):
         model = FinancialModel(base_currency="EUR")
         p = tmp_path / "model.json"
-        model.save(p)
-        loaded = FinancialModel.load(p)
+        _repo.save(model, p)
+        loaded = _repo.load(p)
         assert loaded.base_currency == "EUR"
 
     def test_base_currency_backward_compat(self, tmp_path: Path):
@@ -59,7 +64,7 @@ class TestFinancialModel:
         p = tmp_path / "legacy.json"
         with open(p, "w") as f:
             json.dump({"accounts": []}, f)
-        loaded = FinancialModel.load(p)
+        loaded = _repo.load(p)
         assert loaded.base_currency == "RUB"
 
     def test_exchange_rates_default(self):
@@ -67,18 +72,18 @@ class TestFinancialModel:
         assert len(model.exchange_rates) == 1
         assert model.exchange_rates[0].from_currency == "USD"
         assert model.exchange_rates[0].to_currency == "RUB"
-        assert model.exchange_rates[0].rate == 80.0
+        assert model.exchange_rates[0].rate == Decimal("80")
 
     def test_save_load(self, tmp_path: Path):
         model = FinancialModel()
-        model.accounts.append(Account(name="Test", balance=100.0))
-        model.transactions.append(Transaction(amount=50.0, category="income"))
+        model.accounts.append(Account(name="Test", balance=Decimal("100")))
+        model.transactions.append(Transaction(amount=Decimal("50"), category="income"))
 
         p = tmp_path / "model.json"
-        model.save(p)
+        _repo.save(model, p)
         assert p.exists()
 
-        loaded = FinancialModel.load(p)
+        loaded = _repo.load(p)
         assert len(loaded.accounts) == 1
         assert len(loaded.transactions) == 1
         assert loaded.accounts[0].name == "Test"
@@ -94,16 +99,16 @@ class TestFinancialModel:
     def test_all_entities_roundtrip(self, tmp_path: Path):
         model = FinancialModel(
             accounts=[Account(name="A"), Account(name="B")],
-            transactions=[Transaction(amount=100.0)],
-            recurring=[RecurringCashflow(amount=50.0)],
-            assets=[Asset(name="Stock", value=1000.0)],
-            liabilities=[Liability(name="Loan", balance=500.0, interest=5.0, payment=100.0)],
+            transactions=[Transaction(amount=Decimal("100"))],
+            recurring=[RecurringCashflow(amount=Decimal("50"))],
+            assets=[Asset(name="Stock", value=Decimal("1000"))],
+            liabilities=[Liability(name="Loan", balance=Decimal("500"), interest=Decimal("5"), payment=Decimal("100"))],
             scenarios=[ForecastScenario(name="test")],
-            exchange_rates=[ExchangeRate(from_currency="USD", to_currency="RUB", rate=80.0)],
+            exchange_rates=[ExchangeRate(from_currency="USD", to_currency="RUB", rate=Decimal("80"))],
         )
         p = tmp_path / "full.json"
-        model.save(p)
-        loaded = FinancialModel.load(p)
+        _repo.save(model, p)
+        loaded = _repo.load(p)
         assert len(loaded.accounts) == 2
         assert len(loaded.transactions) == 1
         assert len(loaded.recurring) == 1