fix: ReviewsPage use useAuth for slug; reviews redirect by booking source

- Replace useParams with useAuth().user.hotelSlug in ReviewsPage
- Backend: filter platforms by booking source when review_redirect_source=true
  (booking_com→Booking.com, yandex_travel→Яндекс, airbnb, expedia, vrbo)
- If source has matching platform — show only that one; otherwise all platforms

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

src/pages/ReviewsPage.tsx

@@ -1,5 +1,5 @@
 import { useState, useEffect, useCallback } from 'react'
-import { useParams } from 'react-router-dom'
+import { useAuth } from '../contexts/AuthContext'
 import {
   Star, ThumbsDown, Copy, CheckCheck, MessageSquare, QrCode,
   ArrowUpRight, Plus, Trash2, ExternalLink, Settings2,
@@ -65,7 +65,8 @@ type Tab = 'pending' | 'published' | 'all' | 'preview' | 'settings'
 // ── Component ─────────────────────────────────────────────────────────────────
 
 export function ReviewsPage() {
-  const { slug } = useParams<{ slug: string }>()
+  const { user } = useAuth()
+  const slug = user?.hotelSlug ?? ''
 
   const [reviews, setReviews]     = useState<ReviewApi[]>([])
   const [loading, setLoading]     = useState(true)