Refactor authentication and session management

- Removed session-based user retrieval from dependencies.py and main.py.
- Eliminated SessionMiddleware and related session handling code.
- Updated dashboard and team views to directly query user data from the database.
- Simplified redeem and team management views to remove authentication checks.
- Adjusted templates to reflect changes in user context handling.
- Added camera selection feature in scan_qr.html for improved QR code scanning.
- Cleaned up Docker configuration and requirements for better deployment.

app/db_init.py

@@ -6,10 +6,15 @@ import random
 from datetime import datetime, timedelta
 from sqlalchemy import inspect
 from sqlalchemy.orm import Session
+from passlib.context import CryptContext
 
 from .models import User, Team, TeamMembership, QRTicket
 from .db import SessionLocal
-from .auth import get_password_hash
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+def get_password_hash(password: str) -> str:
+    return pwd_context.hash(password)
 
 def table_has_column(engine, table_name, column_name):
     """Check if a table has a specific column."""