Serve PDFs locally and automate updates from GitHub

- Add scripts/update-pdfs.js to download latest PDFs - Add cv.pdf and
resume.pdf to public/publications - Update build script to run
update-pdfs before next build - Switch CV and resume URLs to local files
in cv/page.tsx - Add .vercel to .gitignore and vercel.json for
deployment config - Update Next.js to 15.5.2 in package.json and
bun.lock - Update next-env.d.ts and tsconfig.json for new types and
script exclusion

vercel.json

@@ -0,0 +1,36 @@
+{
+  "buildCommand": "bun run build",
+  "installCommand": "bun install",
+  "functions": {
+    "src/app/api/**/*.ts": {
+      "maxDuration": 30
+    }
+  },
+  "headers": [
+    {
+      "source": "/publications/(.*)\\.pdf",
+      "headers": [
+        {
+          "key": "Cache-Control",
+          "value": "public, max-age=86400, s-maxage=86400"
+        },
+        {
+          "key": "Content-Type",
+          "value": "application/pdf"
+        },
+        {
+          "key": "Content-Disposition",
+          "value": "inline"
+        }
+      ]
+    }
+  ],
+  "rewrites": [
+    {
+      "source": "/api/publications/:filename",
+      "destination": "/publications/:filename"
+    }
+  ],
+
+  "framework": "nextjs"
+}