Optimize release build times with thin LTO

Switch from fat LTO to thin LTO for faster release builds while maintaining similar performance characteristics.

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Cargo.toml

@@ -7,7 +7,7 @@ edition = "2024"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [profile.release]
-lto = true
+lto = "thin"
 
 [dependencies]
 actix = "0.13.1"