fix: change -d2e to -D in source instead of patching Commander.js

bun build caches Commander.js from npm, making postinstall sed patch
ineffective. Directly changed the flag to single-char -D in:
- src/main.tsx (Option definition)
- src/utils/debug.ts (argv check)

Removed Commander.js patching from postinstall.sh.

scripts/postinstall.sh

@@ -117,13 +117,3 @@ STUBEOF
 fi
 
 echo "[postinstall] Stubs created."
-
-# ── Patch Commander.js for multi-char short flags ───────────────────────────
-OPTION_JS=$(find node_modules -path "*/commander/lib/option.js" -type f | head -1)
-if [ -n "$OPTION_JS" ]; then
-  # Patch 1: shortFlagExp — allow one or more chars after dash
-  sed -i "s|shortFlagExp = /\^-\\[^-\\]\\$/|shortFlagExp = /\^-[^-]+\$/|" "$OPTION_JS"
-  # Patch 2: disable single-char short flag restriction
-  sed -i "s|if (/\\^-\\[^-\\]\\[^-\\]/.test(unsupportedFlag))|if (false)|" "$OPTION_JS"
-  echo "[postinstall] Patched Commander.js for multi-char short flags"
-fi