fix(auth): i18n и react-hook-form на странице логина

Добавлены i18next, схема zod и react-hook-form для формы входа.

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

src/locales/en.json

@@ -0,0 +1,34 @@
+{
+  "menu": {
+    "dashboard": "Dashboard",
+    "users": "Users",
+    "calendars": "Calendars",
+    "events": "Events",
+    "reports": "Reports",
+    "reviews": "Reviews",
+    "bannedWords": "Banned words",
+    "tickets": "Tickets",
+    "subscriptions": "Subscriptions",
+    "admins": "Admins",
+    "audit": "Audit",
+    "monitoring": "Monitoring"
+  },
+  "profile": {
+    "title": "My profile",
+    "edit": "Edit",
+    "saved": "Profile updated"
+  },
+  "login": {
+    "title": "Sign in",
+    "email": "Email",
+    "password": "Password",
+    "submit": "Sign in",
+    "invalid_credentials": "Invalid email or password",
+    "insufficient_permissions": "Insufficient permissions",
+    "error": "Sign-in error"
+  },
+  "ws": {
+    "newReport": "New report",
+    "newTicket": "New ticket"
+  }
+}