Ship Novya PWA with backend for deployable production use.

Fix production TypeScript builds and add DEPLOY.md so the app can be hosted from this repo.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/modules/auth/password.ts

@@ -0,0 +1,24 @@
+import { hash, verify, Algorithm } from '@node-rs/argon2';
+
+const ARGON2_OPTIONS = {
+  algorithm: Algorithm.Argon2id,
+  memoryCost: 19_456,
+  timeCost: 2,
+  parallelism: 1,
+};
+
+export async function hashPassword(password: string): Promise<string> {
+  return hash(password, ARGON2_OPTIONS);
+}
+
+export async function verifyPassword(password: string, passwordHash: string): Promise<boolean> {
+  try {
+    return await verify(passwordHash, password);
+  } catch {
+    return false;
+  }
+}
+
+export function isArgon2idHash(value: string): boolean {
+  return value.startsWith('$argon2id$');
+}