feat: major project restructure - move Django to backend dir and fix critical imports

- Restructure project: moved Django backend to backend/ directory
- Add frontend/ directory for future Next.js application
- Add shared/ directory for common resources
- Fix critical Django import errors:
  - Add missing sys.path modification for apps directory
  - Fix undefined CATEGORY_CHOICES imports in rides module
  - Fix media migration undefined references
  - Remove unused imports and f-strings without placeholders
- Install missing django-environ dependency
- Django server now runs without ModuleNotFoundError
- Update .gitignore and README for new structure
- Add pnpm workspace configuration for monorepo setup

templates/components/status_badge.html

@@ -1,17 +0,0 @@
-{% comment %}
-Reusable status badge component with consistent styling.
-Usage: {% include 'components/status_badge.html' with status="OPERATING" %}
-{% endcomment %}
-
-{% load park_tags %}
-
-{% with status_config=status|get_status_config %}
-<span class="inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium {{ status_config.classes }}">
-    {% if status_config.icon %}
-    <svg class="-ml-0.5 mr-1.5 h-2 w-2" fill="currentColor" viewBox="0 0 8 8">
-        <circle cx="4" cy="4" r="3" />
-    </svg>
-    {% endif %}
-    {{ status_config.label }}
-</span>
-{% endwith %}