feat(website): add SEO, sitemap, redirects, CI workflow, and Vercel config (#10156)

## Summary

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## Changes

- **What**: <!-- Core functionality added/modified -->
- **Breaking**: <!-- Any breaking changes (if none, remove this line)
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- **Dependencies**: <!-- New dependencies (if none, remove this line)
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## Review Focus

<!-- Critical design decisions or edge cases that need attention -->

<!-- If this PR fixes an issue, uncomment and update the line below -->
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## Screenshots (if applicable)

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┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-10156-feat-website-add-SEO-sitemap-redirects-CI-workflow-and-Vercel-config-3266d73d3650816ab9eaebd11072d481)
by [Unito](https://www.unito.io)

---------

Co-authored-by: GitHub Action <action@github.com>

apps/website/vercel.json

@@ -0,0 +1,26 @@
+{
+  "$schema": "https://openapi.vercel.sh/vercel.json",
+  "buildCommand": "pnpm --filter @comfyorg/website build",
+  "outputDirectory": "apps/website/dist",
+  "installCommand": "pnpm install --frozen-lockfile",
+  "framework": null,
+  "redirects": [
+    {
+      "source": "/pricing",
+      "destination": "/cloud/pricing",
+      "permanent": true
+    },
+    {
+      "source": "/enterprise",
+      "destination": "/cloud/enterprise",
+      "permanent": true
+    },
+    {
+      "source": "/blog",
+      "destination": "https://blog.comfy.org/",
+      "permanent": true
+    },
+    { "source": "/contact", "destination": "/about", "permanent": true },
+    { "source": "/press", "destination": "/about", "permanent": true }
+  ]
+}