Add password letter requirement + labeled strength UI + auto-capitalize name fields

- Reject pure-numeric passwords (must contain ≥1 letter) in RegisterForm, ResetPasswordPage, and backend register/reset-password handlers
- Replace bare strength bars with labeled 2×2 grid: ≥8 символов, Содержит букву, Заглавная буква, Цифра
- Auto-capitalize first letter of each word in "Название отеля" and "Контактное лицо" fields (autoCapitalize="words" + JS handler)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/routes/auth.ts

@@ -117,6 +117,10 @@ const auth: FastifyPluginAsync = async (fastify) => {
     async (request, reply) => {
       const { hotelName, address, contact, email, phone, password } = request.body
 
+      if (!/[a-zA-Zа-яА-ЯёЁ]/.test(password)) {
+        return reply.code(400).send({ error: 'Пароль должен содержать хотя бы одну букву' })
+      }
+
       const { rows: existing } = await db.query(
         'SELECT id FROM users WHERE email = $1',
         [email.toLowerCase().trim()],
@@ -346,6 +350,11 @@ const auth: FastifyPluginAsync = async (fastify) => {
     },
     async (request, reply) => {
       const { token, password } = request.body
+
+      if (!/[a-zA-Zа-яА-ЯёЁ]/.test(password)) {
+        return reply.code(400).send({ error: 'Пароль должен содержать хотя бы одну букву' })
+      }
+
       const { rows } = await db.query(
         `SELECT id FROM users
           WHERE reset_token = $1