feat: add internal_component block type with contact form

InternalComponentBlock dispatches on `component` field value.
ContactFormComponent submits via /api/contact (SvelteKit proxy →
CMS /api/forms/kontakt/submit) with honeypot + client_age_ms.
BlockRenderer and block-types.ts updated accordingly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/components/BlockRenderer.svelte

@@ -16,6 +16,7 @@
   import CalendarBlock from "./blocks/CalendarBlock.svelte";
   import OrganisationsBlock from "./blocks/OrganisationsBlock.svelte";
   import OpnFormBlock from "./blocks/OpnFormBlock.svelte";
+  import InternalComponentBlock from "./blocks/InternalComponentBlock.svelte";
   import DeadlineBannerBlock from "./blocks/DeadlineBannerBlock.svelte";
   import StrommixBlock from "./blocks/StrommixBlock.svelte";
   import WindkarteBlock from "./blocks/WindkarteBlock.svelte";
@@ -39,6 +40,7 @@
     CalendarBlockData,
     OrganisationsBlockData,
     OpnFormBlockData,
+    InternalComponentBlockData,
     DeadlineBannerBlockData,
     LiveStrommixBlockData,
     WindMapBlockData,
@@ -86,6 +88,8 @@
   <OrganisationsBlock block={block as OrganisationsBlockData} />
 {:else if type === "opnform"}
   <OpnFormBlock block={block as OpnFormBlockData} />
+{:else if type === "internal_component"}
+  <InternalComponentBlock block={block as InternalComponentBlockData} />
 {:else if type === "deadline_banner"}
   <DeadlineBannerBlock block={block as DeadlineBannerBlockData} />
 {:else if type === "live_strommix"}