feat: SQLAlchemy async database setup

fablednetmon/models/__init__.py

@@ -0,0 +1,4 @@
+from .base import Base
+from .users import User
+
+__all__ = ["Base", "User"]

fablednetmon/models/base.py

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+from sqlalchemy.orm import DeclarativeBase
+
+
+class Base(DeclarativeBase):
+    pass

fablednetmon/models/users.py

@@ -0,0 +1,2 @@
+# fablednetmon/models/users.py — stub, filled in Task 4
+from .base import Base