Import source: app/backend/scripts/apply-schema.mjs

Import the existing local project snapshot. This commit organizes existing files; it does not represent newly developed functionality.

app/backend/scripts/apply-schema.mjs

@@ -0,0 +1,10 @@
+import { existsSync } from 'node:fs';
+import { spawnSync } from 'node:child_process';
+
+const hasMigrations = existsSync(new URL('../prisma/migrations', import.meta.url));
+const args = hasMigrations
+  ? ['prisma', 'migrate', 'deploy']
+  : ['prisma', 'db', 'push', '--skip-generate'];
+
+const result = spawnSync('npx', args, { stdio: 'inherit', shell: process.platform === 'win32' });
+process.exit(result.status ?? 1);