feat(analytics): pull pm86 site-id from CMS page_config, drop env var

- +layout.server: expose pageConfig.analyticsPm86SiteId on layout data
- +layout.svelte: inject analytics.pm86.de script when CMS value present
- +error.svelte: light 404 page with wald-700 accent, dropped dark gradient
- .env.example + deploy.yml: remove PUBLIC_ANALYTICS_PM86_SITE_ID

src/routes/+error.svelte

@@ -15,35 +15,29 @@
   <meta name="robots" content="noindex" />
 </svelte:head>
 
-<section class="bg-linear-to-br from-wald-700 via-wald-800 to-zinc-900 text-white">
-  <div class="container-custom py-20 md:py-28 text-center">
-    <div class="mx-auto inline-flex h-20 w-20 items-center justify-center rounded-full bg-white/10 backdrop-blur ring-1 ring-white/20">
-      <Icon
-        icon={isNotFound ? 'mdi:map-marker-question-outline' : 'mdi:alert-octagon-outline'}
-        class="h-10 w-10"
-      />
-    </div>
-    <p class="mt-6 text-7xl md:text-8xl font-extrabold tracking-tight">{status}</p>
-    <h1 class="mt-3 text-2xl md:text-3xl font-semibold">
+<section>
+  <div class="container-custom pt-10 text-center">
+    <p class="mt-6 text-7xl md:text-8xl font-extrabold tracking-tight text-wald-700">{status}</p>
+    <h1 class="mt-3 text-2xl md:text-3xl font-semibold text-zinc-900">
       {isNotFound ? t('page_404_title') : `Fehler ${status}`}
     </h1>
     {#if isNotFound}
-      <p class="mx-auto mt-4 max-w-xl text-base text-white/80">{t('page_404_text')}</p>
+      <p class="mx-auto mt-4 max-w-xl text-base text-zinc-600">{t('page_404_text')}</p>
     {:else if message}
-      <p class="mx-auto mt-4 max-w-xl text-base text-white/80">{message}</p>
+      <p class="mx-auto mt-4 max-w-xl text-base text-zinc-600">{message}</p>
     {/if}
 
     <div class="mt-8 flex flex-wrap items-center justify-center gap-3">
       <a
         href="/"
-        class="inline-flex items-center gap-2 rounded-sm bg-white px-5 py-2.5 text-sm font-medium text-zinc-900 hover:bg-zinc-100 no-underline"
+        class="inline-flex items-center gap-2 rounded-sm bg-wald-700 px-5 py-2.5 text-sm font-medium text-white hover:bg-wald-800 no-underline"
       >
         <Icon icon="mdi:home-outline" class="h-4 w-4" />
         {t('page_404_back')}
       </a>
       <a
         href="/posts/"
-        class="inline-flex items-center gap-2 rounded-sm border border-white/40 px-5 py-2.5 text-sm font-medium text-white hover:bg-white/10 no-underline"
+        class="inline-flex items-center gap-2 rounded-sm border border-zinc-300 bg-white px-5 py-2.5 text-sm font-medium text-zinc-700 hover:bg-zinc-100 no-underline"
       >
         <Icon icon="mdi:file-document-outline" class="h-4 w-4" />
         Zu den Beiträgen

src/routes/+layout.server.ts

@@ -238,5 +238,7 @@ export const load: LayoutServerLoad = async ({ locals }) => {
     pageConfig,
     seoTitleTemplate: pageConfig?.seoTitle ?? null,
     seoDescriptionTemplate: pageConfig?.seoDescription ?? null,
+    analyticsPm86SiteId:
+      (pageConfig as { analyticsPm86SiteId?: string } | null)?.analyticsPm86SiteId ?? null,
   };
 };

src/routes/+layout.svelte

@@ -126,11 +126,11 @@
       data-website-id={import.meta.env.PUBLIC_UMAMI_WEBSITE_ID}
     ></script>
   {/if}
-  {#if import.meta.env.PUBLIC_ANALYTICS_PM86_SITE_ID}
+  {#if data.analyticsPm86SiteId}
     <script
       defer
       src="https://analytics.pm86.de/api/script.js"
-      data-site-id={import.meta.env.PUBLIC_ANALYTICS_PM86_SITE_ID}
+      data-site-id={data.analyticsPm86SiteId}
     ></script>
   {/if}
   {#if formbricksScript}