v0.6.0 - Ajout _internal pour fix erreur DLL

Changements :
- Ajout du dossier _internal/ (DLL Python generees par PyInstaller --onedir)
- Resout l'erreur "Failed to load Python DLL" : plus d'extraction dans %TEMP%
- build.bat copie automatiquement _internal/ a la racine apres chaque build
- _internal/ a re-committer uniquement si la version de Python change

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

_internal/_tcl_data/msgs/zh_sg.msg

@@ -0,0 +1,8 @@
+# created by tools/loadICU.tcl -- do not edit
+namespace eval ::tcl::clock {
+    ::msgcat::mcset zh_SG AM "\u4e0a\u5348"
+    ::msgcat::mcset zh_SG PM "\u4e2d\u5348"
+    ::msgcat::mcset zh_SG DATE_FORMAT "%d %B %Y"
+    ::msgcat::mcset zh_SG TIME_FORMAT_12 "%P %I:%M:%S"
+    ::msgcat::mcset zh_SG DATE_TIME_FORMAT "%d %B %Y %P %I:%M:%S %z"
+}