docs: stabilize website diagrams

website/package.json

@@ -12,11 +12,13 @@
     "serve": "docusaurus serve",
     "write-translations": "docusaurus write-translations",
     "write-heading-ids": "docusaurus write-heading-ids",
-    "typecheck": "tsc"
+    "typecheck": "tsc",
+    "lint:diagrams": "ascii-guard lint docs"
   },
   "dependencies": {
     "@docusaurus/core": "3.9.2",
     "@docusaurus/preset-classic": "3.9.2",
+    "@docusaurus/theme-mermaid": "^3.9.2",
     "@easyops-cn/docusaurus-search-local": "^0.55.1",
     "@mdx-js/react": "^3.0.0",
     "clsx": "^2.0.0",