feat: update dependencies and enhance privacy policy

Replace "@vercel/analytics" with "@tryghost/content-api" and add 
"node-fetch" to dependencies. Remove "@vercel/speed-insights" to 
streamline the package. Update robots.txt to dis access to 
"/legal-notice" and "/privacy-policy". Change <p> tags to <div> in 
the Privacy Policy for better structure. Update the last modified 
date in the Legal Notice. Add a new API route for fetching images 
with error handling for missing URL parameters.

package.json

@@ -10,12 +10,12 @@
   },
   "dependencies": {
     "@prisma/client": "^6.1.0",
-    "@vercel/analytics": "^1.4.1",
+    "@tryghost/content-api": "^1.11.21",
     "@vercel/og": "^0.6.5",
-    "@vercel/speed-insights": "^1.1.0",
     "dotenv": "^16.4.7",
     "gray-matter": "^4.0.3",
     "next": "15.1.3",
+    "node-fetch": "^3.3.2",
     "nodemailer": "^6.10.0",
     "prisma": "^6.1.0",
     "react": "^19.0.0",