feat: added seseion for sqlite, alembic and ruff, model Timerr, schemas.py, mixin for id, cruds: create timer, get timer, settings.py for db

kawai_focus/database/mixins.py

@@ -0,0 +1,13 @@
+from sqlalchemy.orm import Mapped, mapped_column  
+from sqlalchemy import Integer
+
+
+class IDMixin:
+    """Базовый класс для моделей с id"""
+
+    id: Mapped[int] = mapped_column(
+        Integer,
+        name='id',
+        primary_key=True,
+        autoincrement=True
+    )