feat: implement counter management application with drag-and-drop functionality

- Add main application component (App.tsx) to manage counters
- Create Counter component for individual counter display and editing
- Implement CreateCounter component for adding new counters
- Add API utility for handling server requests
- Set up Vite configuration with proxy for API calls
- Introduce TypeScript configuration for app and node environments
- Style application with global CSS for consistent design

backend/prisma/schema.prisma

@@ -0,0 +1,18 @@
+datasource db {
+    provider = "sqlite"
+    url      = "file:../data/sqlite.db"
+}
+
+generator client {
+    provider = "prisma-client-js"
+}
+
+model Counter {
+    id        Int      @id @default(autoincrement())
+    name      String? // human-friendly name for the counter
+    value     Int      @default(0)
+    imageUrl  String? // nullable URL for uploaded image
+    position  Int      @default(0) // used for ordering
+    createdAt DateTime @default(now())
+    updatedAt DateTime @updatedAt
+}