feat: complete monorepo structure with frontend and shared resources

- Add complete backend/ directory with full Django application
- Add frontend/ directory with Vite + TypeScript setup ready for Next.js
- Add comprehensive shared/ directory with:
  - Complete documentation and memory-bank archives
  - Media files and avatars (letters, park/ride images)
  - Deployment scripts and automation tools
  - Shared types and utilities
- Add architecture/ directory with migration guides
- Configure pnpm workspace for monorepo development
- Update .gitignore to exclude .django_tailwind_cli/ build artifacts
- Preserve all historical documentation in shared/docs/memory-bank/
- Set up proper structure for full-stack development with shared resources

backend/apps/rides/signals.py

@@ -0,0 +1,17 @@
+from django.db.models.signals import pre_save
+from django.dispatch import receiver
+from django.utils import timezone
+from .models import Ride
+
+
+@receiver(pre_save, sender=Ride)
+def handle_ride_status(sender, instance, **kwargs):
+    """Handle ride status changes based on closing date"""
+    if instance.closing_date:
+        today = timezone.now().date()
+
+        # If we've reached the closing date and status is "Closing"
+        if today >= instance.closing_date and instance.status == "CLOSING":
+            # Change to the selected post-closing status
+            instance.status = instance.post_closing_status or "SBNO"
+            instance.status_since = instance.closing_date