fix(blog): add missing mintelP/TLDR renderers, fix iconList, diagram blocks, reduce AI components to 13

- Add mintelP renderer with inline markdown link/marker support (228 broken blocks)
- Add mintelTldr renderer for summary boxes
- Fix iconList to display item.title instead of empty item.description
- Rewire all 6 diagram block types to render via Mermaid
- Remove ai property from 30 non-essential blocks (46 -> 13)
- Tighten MemeCard to 5 verified templates, max 1 per article
- Fix PerformanceChartBlock syntax after ai removal

apps/web/src/payload/blocks/ImageTextBlock.ts

@@ -11,12 +11,6 @@ export const ImageTextBlock: MintelBlock = {
   admin: {
     group: "MDX Components",
   },
-  ai: {
-    name: "ImageText",
-    description: "Layout component for image next to explanatory text.",
-    usageExample:
-      '\'<ImageText image="/img.jpg" title="Architektur">Erklärung...</ImageText>\'',
-  },
   fields: [
     {
       name: "image",