Initial commit: STR Optimization Manager MVP

Full-stack short-term rental management platform with:
- React/Vite frontend with dark theme dashboard, performance, pricing,
  reservations, experiments, and settings pages
- Fastify API server with auth, platform management, performance tracking,
  pricing, reservations, experiments, and weekly report endpoints
- Playwright-based scraper service with Airbnb adapter (login with MFA,
  performance metrics, reservations, calendar pricing, price changes)
- VRBO adapter scaffold and mock adapter for development
- PostgreSQL with Drizzle ORM, migrations, and seed scripts
- Job queue with worker for async scraping tasks
- AES-256-GCM credential encryption for platform credentials
- Session cookie persistence for scraper browser sessions
- Docker Compose for PostgreSQL database

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

apps/frontend/src/hooks/useAuth.ts

@@ -0,0 +1,47 @@
+import { useState, useEffect, useCallback } from 'react';
+import { api, ApiError } from '@/lib/api';
+
+interface AuthState {
+  isAuthenticated: boolean;
+  username: string | null;
+  isLoading: boolean;
+}
+
+export function useAuth() {
+  const [state, setState] = useState<AuthState>({
+    isAuthenticated: false,
+    username: null,
+    isLoading: true,
+  });
+
+  const checkSession = useCallback(async () => {
+    try {
+      const data = await api.me();
+      setState({ isAuthenticated: true, username: data.username, isLoading: false });
+    } catch {
+      setState({ isAuthenticated: false, username: null, isLoading: false });
+    }
+  }, []);
+
+  useEffect(() => {
+    checkSession();
+  }, [checkSession]);
+
+  const login = async (username: string, password: string) => {
+    try {
+      await api.login(username, password);
+      setState({ isAuthenticated: true, username, isLoading: false });
+      return true;
+    } catch (err) {
+      if (err instanceof ApiError) throw err;
+      throw new Error('Login failed');
+    }
+  };
+
+  const logout = async () => {
+    await api.logout();
+    setState({ isAuthenticated: false, username: null, isLoading: false });
+  };
+
+  return { ...state, login, logout, checkSession };
+}