added admin dashboard

src/lib/server/storage.ts

@@ -0,0 +1,29 @@
+import { readFileSync, writeFileSync, existsSync, mkdirSync, renameSync } from 'node:fs';
+import { dirname, join } from 'node:path';
+
+const DATA_DIR = join(process.cwd(), 'data');
+
+if (!existsSync(DATA_DIR)) mkdirSync(DATA_DIR, { recursive: true });
+
+export function dataPath(name: string): string {
+  return join(DATA_DIR, name);
+}
+
+export function readJson<T>(name: string, fallback: T): T {
+  const p = dataPath(name);
+  if (!existsSync(p)) return fallback;
+  try {
+    return JSON.parse(readFileSync(p, 'utf8')) as T;
+  } catch {
+    return fallback;
+  }
+}
+
+export function writeJson<T>(name: string, value: T): void {
+  const p = dataPath(name);
+  const dir = dirname(p);
+  if (!existsSync(dir)) mkdirSync(dir, { recursive: true });
+  const tmp = `${p}.tmp`;
+  writeFileSync(tmp, JSON.stringify(value, null, 2), 'utf8');
+  renameSync(tmp, p);
+}