Scaffold @forte/admin package with React, Vite, shadcn/ui, TanStack Router

Sets up the admin frontend with login page, auth guard, API client, Zustand
auth store, and all shadcn/ui components. Vite proxies /v1 to backend in dev.

packages/admin/src/stores/auth.store.ts

@@ -0,0 +1,37 @@
+import { create } from 'zustand'
+
+interface User {
+  id: string
+  email: string
+  firstName: string
+  lastName: string
+  role: string
+}
+
+interface AuthState {
+  token: string | null
+  user: User | null
+  companyId: string | null
+  setAuth: (token: string, user: User) => void
+  logout: () => void
+}
+
+function decodeJwtPayload(token: string): { id: string; companyId: string; role: string } {
+  const payload = token.split('.')[1]
+  return JSON.parse(atob(payload))
+}
+
+export const useAuthStore = create<AuthState>((set) => ({
+  token: null,
+  user: null,
+  companyId: null,
+
+  setAuth: (token, user) => {
+    const payload = decodeJwtPayload(token)
+    set({ token, user, companyId: payload.companyId })
+  },
+
+  logout: () => {
+    set({ token: null, user: null, companyId: null })
+  },
+}))