fix: Move vercel.json to root with explicit website directory config

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Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: 2 people

vercel.json

@@ -0,0 +1,6 @@
+{
+  "buildCommand": "cd website && npm install && npm run build:railway",
+  "outputDirectory": "website/.next",
+  "installCommand": "cd website && npm install",
+  "framework": "nextjs"
+}