Implement team join request functionality with views and actions

- Added join_requests.html template for displaying pending join requests.
- Created join_team.html template for users to submit join requests.
- Implemented request_processed.html template to show the result of join request processing.
- Developed authentication utilities for user session management.
- Introduced convenience redirects for common URL patterns.
- Established team management routes and actions for creating, editing, and joining teams.
- Added functionality for approving and denying join requests with email notifications.
- Enhanced team views to include user permissions and team member details.
- Implemented utility functions for team-related operations such as calculating total points and team rank.

app/auth/utils.py

@@ -0,0 +1,26 @@
+from fastapi import Request
+from sqlalchemy.orm import Session
+from ..models import User
+import logging
+
+logger = logging.getLogger(__name__)
+
+def get_current_user_from_session(request: Request, db: Session):
+    """Get the current user from the session."""
+    try:
+        if hasattr(request.state, "user") and request.state.user is not None:
+            # User is already in request state, return it
+            return request.state.user
+            
+        if hasattr(request, "session"):
+            user_id = request.session.get("user_id")
+            if user_id:
+                user = db.query(User).filter(User.id == user_id).first()
+                if user:
+                    # Set it in the request state for future use
+                    request.state.user = user
+                    return user
+    except Exception as e:
+        logger.error(f"Error retrieving user from session: {str(e)}")
+    
+    return None