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/StatsGridBlock.ts

@@ -11,13 +11,6 @@ export const StatsGridBlock: MintelBlock = {
   admin: {
     group: "MDX Components",
   },
-  ai: {
-    name: "StatsGrid",
-    description:
-      "Grid of 2–4 stat cards in a row. Use tilde (~) to separate stats, pipe (|) to separate value|label|subtext within each stat.",
-    usageExample:
-      "'<StatsGrid stats=\"53%|Mehr Umsatz|Rakuten 24~33%|Conversion Boost|nach CWV Fix~24%|Top 3 Ranking|bei bestandenen CWV\" />'",
-  },
   fields: [
     {
       name: "stats",