Fix: Rename directory to remove & character causing shell issues

Renamed ebook_backend&admin_panel to ebook_backend_admin_panel
  The & character was being interpreted by shell as background
  process operator, causing 'Dockerfile not found' errors in Coolify.

ebook_backend_admin_panel/admin-backend/utils/auth.py

@@ -0,0 +1,30 @@
+import os
+from dotenv import load_dotenv
+from sqlalchemy.orm import sessionmaker
+from sqlalchemy import create_engine
+from sqlalchemy.orm import declarative_base
+from passlib.context import CryptContext
+
+# Load environment variables
+load_dotenv()
+
+DATABASE_URL = os.getenv("DATABASE_URL", "postgresql://postgres:postgres@localhost:5432/postgres")
+
+engine = create_engine(DATABASE_URL)
+SessionLocal = sessionmaker(bind=engine)
+Base = declarative_base()
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+def hash_password(pw: str) -> str:
+    return pwd_context.hash(pw)
+
+def verify_password(pw: str, hashed: str) -> bool:
+    return pwd_context.verify(pw, hashed)