Add self-hosted auth, admin API, and owner web dashboard

- Replace Clerk with self-hosted JWT auth (register/login/verify, bcrypt
  passwords, Gmail OTP with console fallback)
- Add lib/db.ts pg pool + transaction helpers; seed script migrates legacy
  Clerk-era schema (drop clerk_id, enforce UUID ids and unique email)
- Add owner-gated admin API: stats, users, drivers CRUD, rides
- Add dashboard/ Vite React owner dashboard (login, overview, users,
  fleet, rides) with dev-server proxy to avoid Expo CORS middleware
- Add scripts/set-owner.mjs for role management

lib/password.ts

@@ -0,0 +1,24 @@
+import { randomBytes, scryptSync, timingSafeEqual } from "crypto";
+
+const KEY_LENGTH = 64;
+
+export const hashPassword = (password: string): string => {
+  const salt = randomBytes(16).toString("hex");
+  const hash = scryptSync(password, salt, KEY_LENGTH).toString("hex");
+  return `scrypt:${salt}:${hash}`;
+};
+
+export const verifyPassword = (
+  password: string,
+  stored: string,
+): boolean => {
+  const [scheme, salt, hash] = stored.split(":");
+  if (scheme !== "scrypt" || !salt || !hash) return false;
+
+  const candidate = scryptSync(password, salt, KEY_LENGTH);
+  const expected = Buffer.from(hash, "hex");
+
+  return (
+    candidate.length === expected.length && timingSafeEqual(candidate, expected)
+  );
+};