feat: enable smart placement for optimal global performance

Add smart placement configuration to automatically optimize Worker
execution location based on traffic patterns and R2 bucket proximity.
This reduces latency and improves user experience worldwide.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: nullcoder

wrangler.toml

@@ -3,6 +3,10 @@ main = ".open-next/worker.js"
 compatibility_date = "2024-12-01"
 compatibility_flags = ["nodejs_compat"]
 
+# Smart placement for optimized global performance
+[placement]
+mode = "smart"
+
 # Custom domain
 [[routes]]
 pattern = "ghostpaste.dev"