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/PerformanceChartBlock.ts

@@ -11,13 +11,6 @@ export const PerformanceChartBlock: MintelBlock = {
   admin: {
     group: "MDX Components",
   },
-  ai: {
-    name: "PerformanceChart",
-    description:
-      "A visual chart illustrating performance metrics (e.g. PageSpeed, TTFB) over time or in comparison. Use to emphasize technical improvements.",
-    usageExample:
-      '<PerformanceChart items={[{ label: "Vorher", value: 12 }, { label: "Nachher", value: 98 }]} />',
-  },
   fields: [
     {
       name: "title",