refactor platform admin from backend contract

frontend/platform_admin/scripts/sync-backend-contract.mjs

@@ -0,0 +1,16 @@
+import { execFileSync } from 'node:child_process';
+import { mkdirSync, writeFileSync } from 'node:fs';
+import { dirname, resolve } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const root = resolve(dirname(fileURLToPath(import.meta.url)), '..');
+const backend = resolve(root, '../../backend/api');
+const output = resolve(root, 'src/contracts/platform-resources.json');
+const contract = execFileSync('go', ['run', './cmd/cli', 'resource-contract'], {
+  cwd: backend,
+  encoding: 'utf8',
+});
+JSON.parse(contract);
+mkdirSync(dirname(output), { recursive: true });
+writeFileSync(output, `${contract.trim()}\n`);
+console.log(`已同步后端资源契约：${output}`);