Fix review queue pagination and API fallback handling

apps/web/src/pages/fish/[slug].astro

@@ -9,6 +9,11 @@ try {
   fish = fishes.find(item => item.slug === slug);
   if (fish) items = await api<Activity[]>(`/api/v1/activity?hours=72&fish=${encodeURIComponent(fish.slug)}&limit=100`);
 } catch { unavailable = true; }
+if (unavailable) {
+  Astro.response.status = 503;
+  Astro.response.headers.set("Retry-After", "60");
+  Astro.response.headers.set("Cache-Control", "no-store");
+}
 if (!fish && !unavailable) Astro.response.status = 404;
 const waters = [...new Map(items.map(item => [item.waterbody_slug, item.waterbody])).entries()];
 const schema = fish ? { "@context":"https://schema.org", "@type":"CollectionPage", name:`Где ловить ${fish.name_ru} в RF4`, url:`https://rf4spotter.ru/fish/${fish.slug}` } : null;

apps/web/src/pages/fish/index.astro

@@ -4,6 +4,11 @@ import FishSilhouette from "../../components/FishSilhouette.astro";
 import { api, type DictionaryItem } from "../../lib/api";
 let fishes: DictionaryItem[] = [], unavailable = false;
 try { fishes = await api<DictionaryItem[]>("/api/v1/fishes?limit=500"); } catch { unavailable = true; }
+if (unavailable) {
+  Astro.response.status = 503;
+  Astro.response.headers.set("Retry-After", "60");
+  Astro.response.headers.set("Cache-Control", "no-store");
+}
 ---
 <Layout title="Все виды рыб Russian Fishing 4 — RF4 Spotter" description="Каталог рыб RF4 со свежими точками, уловами, приманками и прозрачными источниками данных.">
   <section class="catalog-hero content-grid"><span class="overline">Справочник RF4</span><h1>Рыбы</h1><p>Выберите вид, чтобы увидеть свежие подтверждённые точки и полевые сигналы.</p></section>