Fix review queue pagination and API fallback handling

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

@@ -9,6 +9,11 @@ try {
   water = waters.find(item => item.slug === slug);
   if (water) items = await api<Activity[]>(`/api/v1/activity?hours=72&waterbody=${encodeURIComponent(water.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 (!water && !unavailable) Astro.response.status = 404;
 const fishes = [...new Map(items.map(item => [item.fish_slug, item.fish])).entries()];
 const schema = water ? { "@context":"https://schema.org", "@type":"CollectionPage", name:`Что ловить на ${water.name_ru} в RF4`, url:`https://rf4spotter.ru/waterbodies/${water.slug}` } : null;

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

@@ -9,6 +9,11 @@ try {
   water = waters.find(item => item.slug === slug); fish = fishes.find(item => item.slug === fishSlug);
   if (water && fish) items = await api<Activity[]>(`/api/v1/activity?hours=72&waterbody=${encodeURIComponent(water.slug)}&fish=${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 ((!water || !fish) && !unavailable) Astro.response.status = 404;
 const valid = Boolean(water && fish);
 const schema = valid ? { "@type":"CollectionPage", name:`${fish!.name_ru} на ${water!.name_ru} в RF4`, url:`https://rf4spotter.ru/waterbodies/${water!.slug}/${fish!.slug}` } : null;

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

@@ -3,6 +3,11 @@ import Layout from "../../layouts/Layout.astro";
 import { api, type DictionaryItem } from "../../lib/api";
 let waters: DictionaryItem[] = [], unavailable = false;
 try { waters = await api<DictionaryItem[]>("/api/v1/waterbodies?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 водоёмы Russian Fishing 4 — RF4 Spotter" description="Каталог водоёмов RF4 со свежими точками, рыбами, приманками и прозрачными источниками данных.">
   <section class="catalog-hero content-grid"><span class="overline">Карта водоёмов RF4</span><h1>Водоёмы</h1><p>Откройте водоём, чтобы увидеть активные виды рыб и последние подтверждённые точки.</p></section>