feat: enable smart placement for optimal global performance (#117)

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"