feat: add database & auth manager classes

server/auth.py

@@ -0,0 +1,12 @@
+from db.database import PostgresConnector
+
+class AuthManager:
+    def __init__(self, db: PostgresConnector, bcrypt):
+        self.db = db
+        self.bcrypt = bcrypt
+
+    def register_user(self, username, password):
+        # Hash the password
+        hashed_password = self.bcrypt.generate_password_hash(password).decode("utf-8")
+        # Save the user to the database
+        self.db.save_user(username, hashed_password)