chore: add diagnostic and seeding scripts

- Add script to generate bcrypt admin password hash.
- Add script to seed sample articles for local development.
- Add Kimi/Moonshot API diagnostic scripts (SDK and direct curl).

scripts/generate-admin-hash.ts

@@ -0,0 +1,10 @@
+import bcrypt from 'bcryptjs';
+
+async function main() {
+  const password = process.argv[2] || 'admin';
+  const hash = await bcrypt.hash(password, 10);
+  console.log(`Password: ${password}`);
+  console.log(`Hash: ${hash}`);
+}
+
+main();