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/views/teams/routes.py

@@ -0,0 +1,57 @@
+from fastapi import APIRouter, Depends, Request
+from fastapi.responses import HTMLResponse
+from sqlalchemy.orm import Session
+
+from ...db import SessionLocal, get_db
+from . import views, actions
+from ...auth.utils import get_current_user_from_session
+
+router = APIRouter()
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+# Main routes for teams
+@router.get("/", response_class=HTMLResponse)
+def list_teams(request: Request, db: Session = Depends(get_db)):
+    """List all available teams"""
+    # No need to explicitly get current user - it's in request.state.user 
+    # from middleware and will be passed to the template
+    return views.list_teams_view(request, db)
+
+@router.get("/{team_id}", response_class=HTMLResponse)
+def team_detail(request: Request, team_id: int, db: Session = Depends(get_db)):
+    """Show details for a specific team."""
+    # User is already available in request.state.user
+    return views.team_detail_view(request, team_id, db)
+
+@router.get("/{team_id}/join", response_class=HTMLResponse)
+async def join_team_page(request: Request, team_id: int, db: Session = Depends(get_db)):
+    """Page for joining a team"""
+    # User is already available in request.state.user
+    return await views.join_team_page_view(request, team_id, db)
+
+# Action routes
+router.add_api_route("/create", actions.create_team_post, methods=["POST"], response_class=HTMLResponse)
+router.add_api_route("/{team_id}/edit", actions.edit_team_post, methods=["POST"], response_class=HTMLResponse)
+router.add_api_route("/{team_id}/join", actions.join_team_request, methods=["POST"], response_class=HTMLResponse)
+router.add_api_route("/join/{team_id}", actions.direct_join_team, methods=["POST"])
+router.add_api_route("/{team_id}/leave", actions.leave_team, methods=["POST"])
+router.add_api_route("/{team_id}/update", actions.update_team, methods=["POST"])
+
+# Add these new routes for handling join requests
+@router.get("/approve-request/{token}", response_class=HTMLResponse)
+async def approve_join_request(request: Request, token: str, db: Session = Depends(get_db)):
+    """Approve a team join request using the provided token"""
+    # User is already available in request.state.user
+    return await actions.approve_join_request(request, token, db)
+
+@router.get("/deny-request/{token}", response_class=HTMLResponse)
+async def deny_join_request(request: Request, token: str, db: Session = Depends(get_db)):
+    """Deny a team join request using the provided token"""
+    # User is already available in request.state.user
+    return await actions.deny_join_request(request, token, db)