Initial commit: VPN Control Panel

- FastAPI REST API with JWT auth
- aiogram 3 Telegram bot with admin middleware
- APScheduler daily tasks (expiry, reminders, revoke, sync)
- SQLAlchemy 2 async ORM with Alembic migrations
- Jinja2 admin panel (Dashboard, Users, Payments, Servers, Tariffs)
- VPN provider abstraction with MockProvider
- Stats service with revenue/subscription analytics
- Docker Compose (PostgreSQL + Redis + app)
- Healthcheck endpoint

app/database.py

@@ -0,0 +1,38 @@
+from sqlalchemy.ext.asyncio import (
+    AsyncSession,
+    async_sessionmaker,
+    create_async_engine,
+)
+from sqlalchemy.orm import DeclarativeBase
+
+from app.settings import settings
+
+engine = create_async_engine(
+    settings.database_url,
+    echo=settings.debug,
+    pool_size=10,
+    max_overflow=20,
+    pool_pre_ping=True,
+)
+
+async_session_factory = async_sessionmaker(
+    engine,
+    class_=AsyncSession,
+    expire_on_commit=False,
+)
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+async def get_db() -> AsyncSession:
+    async with async_session_factory() as session:
+        try:
+            yield session
+            await session.commit()
+        except Exception:
+            await session.rollback()
+            raise
+        finally:
+            await session.close()