feat(auth): add session-based login/logout with bcrypt hashing, seed default admin, templates and navbar updates; add auth middleware; pin SQLAlchemy 1.4.x for Py3.13; update TODOs

app/database.py

@@ -33,8 +33,8 @@ engine = create_engine(
 # Create session factory
 SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
 
-# Create declarative base for models
-Base = declarative_base()
+# Import Base from models for SQLAlchemy 1.x compatibility
+from .models import Base
 
 
 def get_db() -> Generator[Session, None, None]:
@@ -68,6 +68,14 @@ def create_tables() -> None:
     """
     Base.metadata.create_all(bind=engine)
 
+    # Seed default admin user after creating tables
+    try:
+        from .auth import seed_admin_user
+        seed_admin_user()
+    except ImportError:
+        # Handle case where auth module isn't available yet during initial import
+        pass
+
 
 def get_database_url() -> str:
     """