add route matcher to fix /login and /logout routes

Use SvelteKit param matcher to constrain [recipeLang] to only match
'recipes' or 'rezepte', preventing it from catching /login, /logout,
and other non-recipe routes.

src/routes/[recipeLang=recipeLang]/category/+page.svelte

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+<script lang="ts">
+    import type { PageData } from './$types';
+    import "$lib/css/nordtheme.css";
+    let { data }: { data: PageData } = $props();
+    import TagCloud from '$lib/components/TagCloud.svelte';
+    import TagBall from '$lib/components/TagBall.svelte';
+
+    const isEnglish = $derived(data.lang === 'en');
+    const labels = $derived({
+        title: isEnglish ? 'Categories' : 'Kategorien'
+    });
+</script>
+<style>
+	h1 {
+		text-align: center;
+		font-size: 3rem;
+	}
+</style>
+<h1>{labels.title}</h1>
+<section>
+<TagCloud>
+{#each data.categories as tag}
+	<TagBall {tag} ref="/{data.recipeLang}/category">
+	</TagBall>
+{/each}
+</TagCloud>
+</section>

src/routes/[recipeLang=recipeLang]/category/+page.ts

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+import type { PageLoad } from "./$types";
+
+export async function load({ fetch, params}) {
+    const isEnglish = params.recipeLang === 'recipes';
+    const apiBase = isEnglish ? '/api/recipes' : '/api/rezepte';
+
+    const res = await fetch(`${apiBase}/items/category`);
+    const categories= await res.json();
+    return {categories}
+};

src/routes/[recipeLang=recipeLang]/category/[category]/+page.server.ts

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+import type { PageServerLoad } from "./$types";
+import { getUserFavorites, addFavoriteStatusToRecipes } from "$lib/server/favorites";
+
+export const load: PageServerLoad = async ({ fetch, locals, params }) => {
+    const isEnglish = params.recipeLang === 'recipes';
+    const apiBase = isEnglish ? '/api/recipes' : '/api/rezepte';
+
+    const res = await fetch(`${apiBase}/items/category/${params.category}`);
+    const items = await res.json();
+
+    // Get user favorites and session
+    const [userFavorites, session] = await Promise.all([
+        getUserFavorites(fetch, locals),
+        locals.auth()
+    ]);
+
+    return {
+        category: params.category,
+        recipes: addFavoriteStatusToRecipes(items, userFavorites),
+        session
+    };
+};

src/routes/[recipeLang=recipeLang]/category/[category]/+page.svelte

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+<script lang="ts">
+    import type { PageData } from './$types';
+    import Recipes from '$lib/components/Recipes.svelte';
+    import Search from '$lib/components/Search.svelte';
+    let { data }: { data: PageData } = $props();
+    let current_month = new Date().getMonth() + 1;
+    import Card from '$lib/components/Card.svelte'
+    import { rand_array } from '$lib/js/randomize';
+
+    const isEnglish = $derived(data.lang === 'en');
+    const label = $derived(isEnglish ? 'Recipes in Category' : 'Rezepte in Kategorie');
+</script>
+<style>
+	h1 {
+		text-align: center;
+		font-size: 3em;
+	}
+</style>
+<h1>{label} <q>{data.category}</q>:</h1>
+<Search category={data.category} lang={data.lang}></Search>
+<section>
+<Recipes>
+	{#each rand_array(data.recipes) as recipe}
+		<Card {recipe} {current_month} isFavorite={recipe.isFavorite} showFavoriteIndicator={!!data.session?.user} routePrefix="/{data.recipeLang}"></Card>
+	{/each}
+</Recipes>
+</section>