fix: reviews — correct pending/archive logic, rejected_at field, stats, reply email

- Migration 085: add rejected_at to reviews
- pending = !isPublic && !reply && !rejectedAt
- archived = isPublic || reply || rejectedAt
- Stats: avgRating/NPS from all reviews; 'В архиве' = archived count
- sendReply: no longer sets isPublic=true on negative reviews
- reject: sets rejected_at=NOW() (distinct from pending)
- restore: clears rejected_at (now actually works)
- Badge 'Отклонён' for rejected reviews, opacity-60

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

backend/migrations/085_reviews_rejected.sql

@@ -0,0 +1,2 @@
+-- Migration 085 — add rejected_at to reviews for explicit rejected state
+ALTER TABLE reviews ADD COLUMN IF NOT EXISTS rejected_at TIMESTAMPTZ;

backend/src/routes/reviews.ts

@@ -37,7 +37,7 @@ const reviewsRoutes: FastifyPluginAsync = async (fastify) => {
 
       const { rows } = await db.query(
         `SELECT r.id, r.booking_id, r.guest_id, r.guest_name, r.source,
-                r.rating, r.text, r.reply, r.replied_at, r.is_public,
+                r.rating, r.text, r.reply, r.replied_at, r.is_public, r.rejected_at,
                 r.created_at, r.updated_at,
                 b.room_id,
                 rm.number AS room_number,
@@ -54,7 +54,7 @@ const reviewsRoutes: FastifyPluginAsync = async (fastify) => {
   )
 
   // ── PATCH /api/hotels/:slug/reviews/:id ───────────────────────────────────
-  fastify.patch<SlugIdParam & { Body: { reply?: string; isPublic?: boolean } }>(
+  fastify.patch<SlugIdParam & { Body: { reply?: string; isPublic?: boolean; rejected?: boolean } }>(
     '/api/hotels/:slug/reviews/:id',
     { onRequest: [fastify.authenticate] },
     async (request, reply) => {
@@ -65,7 +65,7 @@ const reviewsRoutes: FastifyPluginAsync = async (fastify) => {
       const hotelId = await getHotelId(slug)
       if (!hotelId) return reply.code(404).send({ error: 'Hotel not found' })
 
-      const { reply: replyText, isPublic } = request.body
+      const { reply: replyText, isPublic, rejected } = request.body
       const updates: string[] = []
       const vals: unknown[]   = [id, hotelId]
 
@@ -77,6 +77,9 @@ const reviewsRoutes: FastifyPluginAsync = async (fastify) => {
         vals.push(isPublic)
         updates.push(`is_public = $${vals.length}`)
       }
+      if (rejected === true)  updates.push(`rejected_at = NOW()`)
+      if (rejected === false) updates.push(`rejected_at = NULL`)
+
       if (updates.length === 0) return reply.code(400).send({ error: 'Nothing to update' })
 
       const { rows } = await db.query(