fix: price sorting by period type, pagination, avgRating on dashboard

- Sort by monthlyPrice when periodType=MONTHLY instead of always dailyPrice
- Fix client-side pagination in MyBookingsPage and LandlordListingsPage
- Compute avgRating in /rentals/mine endpoint so dashboard shows ratings
- Fix falsy filter for avgRating=0 on landlord dashboard

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

server/src/routes/rental.ts

@@ -37,10 +37,16 @@ router.get('/mine', authenticate, async (req, res, next) => {
 
     const listings = await prisma.rentalListing.findMany({
       where,
-      select: rentalSelect,
+      select: { ...rentalSelect, reviews: { select: { rating: true } } },
       orderBy: { createdAt: 'desc' },
     });
-    res.json(listings);
+    const withRatings = listings.map(l => ({
+      ...l,
+      avgRating: l.reviews.length > 0
+        ? l.reviews.reduce((sum, r) => sum + r.rating, 0) / l.reviews.length
+        : undefined,
+    }));
+    res.json(withRatings);
   } catch (error) {
     next(error);
   }
@@ -111,8 +117,9 @@ router.get('/', optionalAuth, async (req, res, next) => {
       where.dailyPrice = priceFilter;
     }
 
-    const orderBy = sort === 'price_asc' ? { dailyPrice: 'asc' as const }
-      : sort === 'price_desc' ? { dailyPrice: 'desc' as const }
+    const priceField = periodType === 'MONTHLY' ? 'monthlyPrice' : 'dailyPrice';
+    const orderBy = sort === 'price_asc' ? { [priceField]: 'asc' as const }
+      : sort === 'price_desc' ? { [priceField]: 'desc' as const }
       : sort === 'popular' ? { viewCount: 'desc' as const }
       : { createdAt: 'desc' as const };