feat: Initial Material You client implementation

Implemented a Material You (Material 3) client for the bonch-open-api.
- Added API client with axios
- Added Zustand store for API config and user data
- Added Login and Profile pages
- Set up routing with react-router-dom
- Added global styles with Material 3 tokens

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

src/store/useStore.ts

@@ -0,0 +1,25 @@
+import { create } from 'zustand';
+import { persist } from 'zustand/middleware';
+
+interface AppState {
+  apiDomain: string;
+  apiKey: string;
+  setApiDomain: (domain: string) => void;
+  setApiKey: (key: string) => void;
+  reset: () => void;
+}
+
+export const useStore = create<AppState>()(
+  persist(
+    (set) => ({
+      apiDomain: import.meta.env.VITE_API_DOMAIN || '',
+      apiKey: '',
+      setApiDomain: (apiDomain) => set({ apiDomain }),
+      setApiKey: (apiKey) => set({ apiKey }),
+      reset: () => set({ apiKey: '' }),
+    }),
+    {
+      name: 'bonch-md-storage',
+    }
+  )
+);