docs: vendor the documentation site into the monorepo

Fold the standalone 3x-ui-docs project (Next.js 16 + Fumadocs, deployed to
docs.sanaei.dev) into docs/ so the panel and its documentation share a single
source of truth, the way sing-box keeps its docs in-tree. The old repo becomes
redundant and can be retired.

- Import the full site under docs/ (app, components, content, lib, public,
  scripts, config). The self-contained pnpm project sits alongside the existing
  engineering notes with no filename collisions.
- Re-point "Edit on GitHub" links from MHSanaei/3x-ui-docs to this repo's
  docs/content/docs path (docs/lib/shared.ts, docs/app/.../page.tsx).
- Add docs-ci.yml and docs-deploy.yml under .github/workflows/, scoped to
  docs/** and run with working-directory: docs, since GitHub only runs
  workflows from the repo-root .github/. deploy-static.yml's GitHub Pages
  publish (CNAME docs.sanaei.dev) carries over unchanged.

Follow-up (outside this commit): attach the docs.sanaei.dev custom domain to
this repository's Pages (or set the Vercel project's root directory to docs),
confirm the site is live from the monorepo, then delete MHSanaei/3x-ui-docs.

docs/pnpm-workspace.yaml

@@ -0,0 +1,11 @@
+allowBuilds:
+  esbuild: true
+  sharp: true
+  unrs-resolver: true
+# Force any vulnerable transitive postcss (pulled in by next) up to a patched
+# release — fixes GHSA-qx2v-qp2m-jg93 / CVE-2026-41305 (vulnerable < 8.5.10).
+overrides:
+  'postcss@<8.5.10': '^8.5.15'
+minimumReleaseAgeExclude:
+  - '@mermaid-js/parser@1.2.0'
+  - mermaid@11.16.0