Initial scaffold: full-stack RackMapper application

Complete project scaffold with working auth, REST API, Prisma/SQLite
schema, Docker config, and React frontend for both Rack Planner and
Service Mapper modules. Both server and client pass TypeScript strict
mode with zero errors. Initial migration applied.

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

client/src/store/useAuthStore.ts

@@ -0,0 +1,37 @@
+import { create } from 'zustand';
+import { apiClient } from '../api/client';
+
+interface AuthState {
+  isAuthenticated: boolean;
+  loading: boolean;
+  checkAuth: () => Promise<void>;
+  login: (username: string, password: string) => Promise<void>;
+  logout: () => Promise<void>;
+}
+
+export const useAuthStore = create<AuthState>((set) => ({
+  isAuthenticated: false,
+  loading: true,
+
+  checkAuth: async () => {
+    try {
+      await apiClient.auth.me();
+      set({ isAuthenticated: true, loading: false });
+    } catch {
+      set({ isAuthenticated: false, loading: false });
+    }
+  },
+
+  login: async (username, password) => {
+    await apiClient.auth.login(username, password);
+    set({ isAuthenticated: true });
+  },
+
+  logout: async () => {
+    try {
+      await apiClient.auth.logout();
+    } finally {
+      set({ isAuthenticated: false });
+    }
+  },
+}));