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/static/css/alerts.css

@@ -0,0 +1,44 @@
+/* Alert Styles */
+.alert {
+    @apply fixed z-50 px-4 py-3 transition-all duration-500 transform rounded-lg shadow-lg right-4 top-4;
+    animation: slideIn 0.5s ease-out forwards;
+}
+
+.alert-success {
+    @apply text-white bg-green-500;
+}
+
+.alert-error {
+    @apply text-white bg-red-500;
+}
+
+.alert-info {
+    @apply text-white bg-blue-500;
+}
+
+.alert-warning {
+    @apply text-white bg-yellow-500;
+}
+
+/* Animation keyframes */
+@keyframes slideIn {
+    0% {
+        transform: translateX(100%);
+        opacity: 0;
+    }
+    100% {
+        transform: translateX(0);
+        opacity: 1;
+    }
+}
+
+@keyframes slideOut {
+    0% {
+        transform: translateX(0);
+        opacity: 1;
+    }
+    100% {
+        transform: translateX(100%);
+        opacity: 0;
+    }
+}