Enable source maps for readable stack traces

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/build.sh

@@ -6,4 +6,4 @@ DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 cd "$DIR"
 
-../cmd pnpm ncc build ./app.ts -o dist
+../cmd pnpm ncc build ./app.ts -o dist --source-map

backend/run.sh

@@ -6,4 +6,4 @@ DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 cd "$DIR"
 
-exec ../cmd node dist/index.js "$@"
+exec ../cmd node --enable-source-maps dist/index.js "$@"