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/parks/views_update.py

@@ -0,0 +1,16 @@
+def prepare_changes_data(self, cleaned_data):
+    data = cleaned_data.copy()
+    # Convert model instances to IDs for JSON serialization
+    if data.get("owner"):
+        data["owner"] = data["owner"].id
+    # Convert dates to ISO format strings
+    if data.get("opening_date"):
+        data["opening_date"] = data["opening_date"].isoformat()
+    if data.get("closing_date"):
+        data["closing_date"] = data["closing_date"].isoformat()
+    # Convert Decimal fields to strings
+    decimal_fields = ["latitude", "longitude", "size_acres", "average_rating"]
+    for field in decimal_fields:
+        if data.get(field):
+            data[field] = str(data[field])
+    return data