feat(seo): sitemap, OG/canonical/hreflang, JSON-LD i18n

Add sitemap.xml route enumerating recipes, apologetik args, prayers, and
faith hubs. Drop /static/ from robots.txt — was blocking JSON-LD recipe
images from Google. Add reusable Seo component (OG/Twitter/canonical) and
wire into homepage, faith hub, recipes hub, and apologetik index.

Faith and recipe layouts now emit canonical + hreflang automatically by
swapping known lang slugs; deeper paths whose inner segments aren't safely
translatable (recipe [name], prayer [prayer], apologetik [argId]) are
skipped at the layout and may opt-in per page.

Recipe JSON-LD HowToStep names and baking instructions now resolve via
the recipes i18n table (jsonld_step / jsonld_bake / jsonld_for_duration +
existing at_temp) instead of being hardcoded German — English /recipes/
pages were emitting "Schritt N" in their schema.

src/lib/components/Seo.svelte

@@ -0,0 +1,57 @@
+<script lang="ts">
+	type Alternate = { hreflang: string; href: string };
+
+	interface Props {
+		title: string;
+		description?: string;
+		canonical?: string;
+		ogImage?: string;
+		ogImageAlt?: string;
+		ogType?: 'website' | 'article';
+		siteName?: string;
+		lang?: 'de' | 'en' | 'la';
+		alternates?: Alternate[];
+		twitterCard?: 'summary' | 'summary_large_image';
+	}
+
+	const {
+		title,
+		description,
+		canonical,
+		ogImage,
+		ogImageAlt,
+		ogType = 'website',
+		siteName = 'Bocken',
+		lang,
+		alternates = [],
+		twitterCard = 'summary_large_image',
+	}: Props = $props();
+
+	const localeMap = { de: 'de_DE', en: 'en_US', la: 'la' } as const;
+</script>
+
+<svelte:head>
+	<title>{title}</title>
+	{#if description}<meta name="description" content={description} />{/if}
+	{#if canonical}<link rel="canonical" href={canonical} />{/if}
+
+	<meta property="og:title" content={title} />
+	{#if description}<meta property="og:description" content={description} />{/if}
+	<meta property="og:type" content={ogType} />
+	<meta property="og:site_name" content={siteName} />
+	{#if canonical}<meta property="og:url" content={canonical} />{/if}
+	{#if lang}<meta property="og:locale" content={localeMap[lang]} />{/if}
+	{#if ogImage}
+		<meta property="og:image" content={ogImage} />
+		{#if ogImageAlt}<meta property="og:image:alt" content={ogImageAlt} />{/if}
+	{/if}
+
+	<meta name="twitter:card" content={twitterCard} />
+	<meta name="twitter:title" content={title} />
+	{#if description}<meta name="twitter:description" content={description} />{/if}
+	{#if ogImage}<meta name="twitter:image" content={ogImage} />{/if}
+
+	{#each alternates as a (a.hreflang)}
+		<link rel="alternate" hreflang={a.hreflang} href={a.href} />
+	{/each}
+</svelte:head>

src/lib/i18n/recipes/de.ts

@@ -181,6 +181,11 @@ export const de = {
 	instructions_label: 'Zubereitung',
 	at_temp: 'bei',
 
+	// JSON-LD recipe schema labels (HowToStep names, baking instruction text)
+	jsonld_step: 'Schritt',
+	jsonld_bake: 'Backen',
+	jsonld_for_duration: 'für',
+
 	// CreateStepList baking
 	not_set: 'Nicht gesetzt',
 	duration: 'Dauer',

src/lib/i18n/recipes/en.ts

@@ -181,6 +181,11 @@ export const en = {
 	instructions_label: 'Instructions',
 	at_temp: 'at',
 
+	// JSON-LD recipe schema labels (HowToStep names, baking instruction text)
+	jsonld_step: 'Step',
+	jsonld_bake: 'Bake',
+	jsonld_for_duration: 'for',
+
 	// CreateStepList baking
 	not_set: 'Not set',
 	duration: 'Duration',

src/lib/js/recipeJsonLd.ts

@@ -27,6 +27,7 @@ function parseTimeToISO8601(timeString: string | undefined): string | undefined
 }
 
 import type { RecipeModelType, NutritionMapping } from '$types/types';
+import { m, type RecipesLang } from '$lib/js/recipesI18n';
 
 interface HowToStep {
   "@type": "HowToStep";
@@ -62,7 +63,8 @@ type ReferencedNutrition = {
   baseMultiplier: number;
 };
 
-export function generateRecipeJsonLd(data: RecipeModelType, referencedNutrition?: ReferencedNutrition[]) {
+export function generateRecipeJsonLd(data: RecipeModelType, referencedNutrition?: ReferencedNutrition[], lang: RecipesLang = 'de') {
+  const t = m[lang];
   const jsonLd: RecipeJsonLd = {
     "@context": "https://schema.org",
     "@type": "Recipe",
@@ -126,7 +128,7 @@ export function generateRecipeJsonLd(data: RecipeModelType, referencedNutrition?
         for (let i = 0; i < instructionGroup.steps.length; i++) {
           jsonLd.recipeInstructions.push({
             "@type": "HowToStep",
-            "name": `Schritt ${i + 1}`,
+            "name": `${t.jsonld_step} ${i + 1}`,
             "text": instructionGroup.steps[i]
           });
         }
@@ -137,16 +139,16 @@ export function generateRecipeJsonLd(data: RecipeModelType, referencedNutrition?
   // Add baking instructions if available
   if (data.baking?.temperature || data.baking?.length) {
     const bakingText = [
-      data.baking.temperature ? `bei ${data.baking.temperature}` : '',
-      data.baking.length ? `für ${data.baking.length}` : '',
+      data.baking.temperature ? `${t.at_temp} ${data.baking.temperature}` : '',
+      data.baking.length ? `${t.jsonld_for_duration} ${data.baking.length}` : '',
       data.baking.mode || ''
     ].filter(Boolean).join(' ');
-    
+
     if (bakingText) {
       jsonLd.recipeInstructions.push({
         "@type": "HowToStep",
-        "name": "Backen",
-        "text": `Backen ${bakingText}`
+        "name": t.jsonld_bake,
+        "text": `${t.jsonld_bake} ${bakingText}`
       });
     }
   }